v3.26.3
Portfolio Investments - Unobservable Inputs Used in Fair Value Measurement of Level 3 Investments (Details)
$ in Thousands
Sep. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 5,944,478 [1] $ 6,342,558 [2]
Subordinated Structured Notes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value 0 2,794
Unsecured Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value 5,213 5,195
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value 5,943,354 6,341,325
Level 3 | Debt Securities, First Lien 1 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 1,295,503 $ 1,387,300
Level 3 | Debt Securities, First Lien 1 | Discounted cash flow (Yield analysis) | Minimum | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.086 0.080
Level 3 | Debt Securities, First Lien 1 | Discounted cash flow (Yield analysis) | Maximum | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.247 0.240
Level 3 | Debt Securities, First Lien 1 | Discounted cash flow (Yield analysis) | Weighted Average | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.127 0.120
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 891,876 $ 876,859
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.065 0.065
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis) | Minimum | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.055 0.055
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.105 0.105
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis) | Maximum | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.083 0.083
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.072 0.073
Level 3 | Debt Securities, First Lien 2 | Discounted cash flow (Yield analysis) | Weighted Average | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.060 0.061
Level 3 | Debt Securities, First Lien 3 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.130 0.113
Level 3 | Debt Securities, First Lien 3 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.165 0.160
Level 3 | Debt Securities, First Lien 3 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.140 0.133
Level 3 | Debt Securities, First Lien 3 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 570,356 $ 655,124
Level 3 | Debt Securities, First Lien 3 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.3 5.3
Level 3 | Debt Securities, First Lien 3 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 12.5 12.5
Level 3 | Debt Securities, First Lien 3 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 10.3 9.7
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow) | Minimum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 3.5  
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow) | Minimum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 8.8  
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow) | Maximum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 4.0  
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow) | Maximum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 13.3  
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow) | Weighted Average | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 4.0  
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow) | Weighted Average | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 13.3  
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 469,630 $ 506,062
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   4.8
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   10.0
Level 3 | Debt Securities, First Lien 4 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   8.4
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 434,653 $ 460,264
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 4.8  
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Minimum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   3.5
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Minimum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   8.8
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 10.0  
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Maximum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   4.0
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Maximum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   13.3
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 8.3  
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Weighted Average | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   4.0
Level 3 | Debt Securities, First Lien 5 | Enterprise value waterfall (Market approach) | Weighted Average | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   13.3
Level 3 | Debt Securities, First Lien 6 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 278,120 $ 307,175
Level 3 | Debt Securities, First Lien 6 | Enterprise value waterfall (Market approach) | Minimum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.3 0.3
Level 3 | Debt Securities, First Lien 6 | Enterprise value waterfall (Market approach) | Maximum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 3.5 3.0
Level 3 | Debt Securities, First Lien 6 | Enterprise value waterfall (Market approach) | Weighted Average | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.9 1.5
Level 3 | Debt Securities, First Lien 7 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 54,113 $ 56,537
Level 3 | Debt Securities, First Lien 7 | Enterprise value waterfall (Market approach) | Minimum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.9 0.9
Level 3 | Debt Securities, First Lien 7 | Enterprise value waterfall (Market approach) | Maximum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.6 1.6
Level 3 | Debt Securities, First Lien 7 | Enterprise value waterfall (Market approach) | Weighted Average | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.6 1.3
Level 3 | Debt Securities, First Lien 8 | Discounted cash flow (Yield analysis) | Minimum | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.129 0.131
Level 3 | Debt Securities, First Lien 8 | Discounted cash flow (Yield analysis) | Maximum | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.129 0.131
Level 3 | Debt Securities, First Lien 8 | Discounted cash flow (Yield analysis) | Weighted Average | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.129 0.131
Level 3 | Debt Securities, First Lien 8 | Option Pricing Model | Minimum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.500 0.500
Level 3 | Debt Securities, First Lien 8 | Option Pricing Model | Maximum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.600 0.600
Level 3 | Debt Securities, First Lien 8 | Option Pricing Model | Weighted Average | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.600 0.600
Level 3 | Debt Securities, First Lien 8 | Enterprise market & discounted cash flow approach and option pricing model    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 18,104 $ 18,034
Level 3 | Debt Securities, First Lien 9 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 11,294 $ 11,012
Level 3 | Debt Securities, First Lien 9 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.100 0.100
Level 3 | Debt Securities, First Lien 9 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.200 0.200
Level 3 | Debt Securities, First Lien 9 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.150 0.150
Level 3 | Debt Securities, First Lien 10 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.188 0.183
Level 3 | Debt Securities, First Lien 10 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.208 0.203
Level 3 | Debt Securities, First Lien 10 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.188 0.183
Level 3 | Debt Securities, First Lien 10 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 8,575 $ 9,375
Level 3 | Debt Securities, First Lien 10 | Enterprise value waterfall (Market approach) | Minimum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.1 1.1
Level 3 | Debt Securities, First Lien 10 | Enterprise value waterfall (Market approach) | Maximum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.5 1.5
Level 3 | Debt Securities, First Lien 10 | Enterprise value waterfall (Market approach) | Weighted Average | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.5 1.5
Level 3 | Debt Securities, First Lien 11 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.5  
Level 3 | Debt Securities, First Lien 11 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 7.5  
Level 3 | Debt Securities, First Lien 11 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 7.0  
Level 3 | Debt Securities, First Lien 11 | Enterprise market cash flow approach and option pricing model    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 987  
Level 3 | Debt Securities, First Lien 11 | Option Pricing Model | Minimum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.600  
Level 3 | Debt Securities, First Lien 11 | Option Pricing Model | Maximum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.700  
Level 3 | Debt Securities, First Lien 11 | Option Pricing Model | Weighted Average | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.650  
Level 3 | Debt Securities, Second Lien 1 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 417,369 $ 480,118
Level 3 | Debt Securities, Second Lien 1 | Discounted cash flow (Yield analysis) | Minimum | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.125 0.114
Level 3 | Debt Securities, Second Lien 1 | Discounted cash flow (Yield analysis) | Maximum | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.586 0.577
Level 3 | Debt Securities, Second Lien 1 | Discounted cash flow (Yield analysis) | Weighted Average | Market yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.188 0.170
Level 3 | Debt Securities, Second Lien 2 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 61,802
Level 3 | Debt Securities, Second Lien 2 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   6.3
Level 3 | Debt Securities, Second Lien 2 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   7.3
Level 3 | Debt Securities, Second Lien 2 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   7.3
Level 3 | Debt Securities, Second Lien 2 | Takeout Scenario    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 69,388  
Level 3 | Debt Securities, Second Lien 2 | Takeout Scenario | Minimum | Takeout Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1  
Level 3 | Debt Securities, Second Lien 2 | Takeout Scenario | Maximum | Takeout Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1  
Level 3 | Debt Securities, Second Lien 2 | Takeout Scenario | Weighted Average | Takeout Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1  
Level 3 | Debt Securities, Second Lien 3 | Discounted cash flow (Yield analysis) | Minimum | Equity rates of return    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.250
Level 3 | Debt Securities, Second Lien 3 | Discounted cash flow (Yield analysis) | Maximum | Equity rates of return    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.300
Level 3 | Debt Securities, Second Lien 3 | Discounted cash flow (Yield analysis) | Weighted Average | Equity rates of return    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.250
Level 3 | Debt Securities, Second Lien 3 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 21,402
Level 3 | Debt Securities, Second Lien 3 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 65,232  
Level 3 | Debt Securities, Second Lien 3 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 5.3 9.3
Level 3 | Debt Securities, Second Lien 3 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.3 9.8
Level 3 | Debt Securities, Second Lien 3 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.3 9.5
Level 3 | Debt Securities, Second Lien 4 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.113
Level 3 | Debt Securities, Second Lien 4 | Discounted cash flow (Yield analysis) | Minimum | Equity rates of return    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.250  
Level 3 | Debt Securities, Second Lien 4 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.133
Level 3 | Debt Securities, Second Lien 4 | Discounted cash flow (Yield analysis) | Maximum | Equity rates of return    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.300  
Level 3 | Debt Securities, Second Lien 4 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.123
Level 3 | Debt Securities, Second Lien 4 | Discounted cash flow (Yield analysis) | Weighted Average | Equity rates of return    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.275  
Level 3 | Debt Securities, Second Lien 4 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 21,404 $ 8,429
Level 3 | Debt Securities, Second Lien 4 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 9.5 5.3
Level 3 | Debt Securities, Second Lien 4 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 10.0 8.0
Level 3 | Debt Securities, Second Lien 4 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 9.5 6.6
Level 3 | Debt Securities, Second Lien 5 | Asset recovery analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 670 $ 7,416
Level 3 | Subordinated Structured Notes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value 0 2,794
Level 3 | Subordinated Structured Notes | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 2,794
Level 3 | Subordinated Structured Notes | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.138
Level 3 | Subordinated Structured Notes | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.139
Level 3 | Subordinated Structured Notes | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.139
Level 3 | Unsecured Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value 5,213 $ 5,195
Level 3 | Unsecured Debt | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 5,213 $ 5,195
Level 3 | Unsecured Debt | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 5.3 5.3
Level 3 | Unsecured Debt | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.8 6.8
Level 3 | Unsecured Debt | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.8 6.8
Level 3 | Preferred Equity 1 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 160,562 $ 158,791
Level 3 | Preferred Equity 1 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 3.3 3.5
Level 3 | Preferred Equity 1 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 10.5 10.0
Level 3 | Preferred Equity 1 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 8.7 8.7
Level 3 | Preferred Equity 2 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.5 6.0
Level 3 | Preferred Equity 2 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 7.8 7.5
Level 3 | Preferred Equity 2 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 7.7 7.2
Level 3 | Preferred Equity 2 | Enterprise market cash flow approach and option pricing model    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 31,537 $ 35,496
Level 3 | Preferred Equity 2 | Option Pricing Model | Minimum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.550 0.550
Level 3 | Preferred Equity 2 | Option Pricing Model | Maximum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.700 0.700
Level 3 | Preferred Equity 2 | Option Pricing Model | Weighted Average | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.670 0.669
Level 3 | Liquidation Trust | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 7,586 $ 12,264
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 514,270 $ 503,988
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   4.5
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Minimum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 3.5  
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Minimum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 8.8  
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   11.3
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Maximum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 4.0  
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Maximum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 13.3  
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   8.1
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Weighted Average | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 4.0  
Level 3 | Common Equity/Interests/Warrants 1 | Enterprise value waterfall (Market approach) | Weighted Average | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 13.3  
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 291,348 $ 500,514
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 4.5  
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Minimum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   3.5
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Minimum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   8.8
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 11.0  
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Maximum | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   4.0
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Maximum | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   13.3
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 7.4  
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Weighted Average | Tangible book value multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   4.0
Level 3 | Common Equity/Interests/Warrants 2 | Enterprise value waterfall (Market approach) | Weighted Average | Earnings multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   13.3
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 179,231 $ 187,771
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.065 0.065
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis) | Minimum | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.055 0.055
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.105 0.105
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis) | Maximum | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.083 0.083
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.072 0.073
Level 3 | Common Equity/Interests/Warrants 3 | Discounted cash flow (Yield analysis) | Weighted Average | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.060 0.061
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 52,455 $ 20,720
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.078 0.100
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis) | Minimum | Recovery rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.250  
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.088 0.200
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis) | Maximum | Recovery rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.250  
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.088 0.150
Level 3 | Common Equity/Interests/Warrants 4 | Discounted cash flow (Yield analysis) | Weighted Average | Recovery rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 1.094  
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 16,966
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.065
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis) | Minimum | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.055
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.105
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis) | Maximum | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.083
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.073
Level 3 | Common Equity/Interests/Warrants 5 | Discounted cash flow (Yield analysis) | Weighted Average | Terminal Cap Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.061
Level 3 | Common Equity/Interests/Warrants 5 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 32,106  
Level 3 | Common Equity/Interests/Warrants 5 | Enterprise value waterfall (Market approach) | Minimum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.3  
Level 3 | Common Equity/Interests/Warrants 5 | Enterprise value waterfall (Market approach) | Maximum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 3.5  
Level 3 | Common Equity/Interests/Warrants 5 | Enterprise value waterfall (Market approach) | Weighted Average | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.7  
Level 3 | Common Equity/Interests/Warrants 6 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.130 0.123
Level 3 | Common Equity/Interests/Warrants 6 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.165 0.160
Level 3 | Common Equity/Interests/Warrants 6 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.143 0.150
Level 3 | Common Equity/Interests/Warrants 6 | Enterprise value waterfall (Market approach) and Enterprise value waterfall (Discounted cash flow)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 26,010 $ 14,710
Level 3 | Common Equity/Interests/Warrants 6 | Enterprise value waterfall (Market approach) | Minimum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 6.3 5.8
Level 3 | Common Equity/Interests/Warrants 6 | Enterprise value waterfall (Market approach) | Maximum | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 12.5 12.5
Level 3 | Common Equity/Interests/Warrants 6 | Enterprise value waterfall (Market approach) | Weighted Average | EBITDA multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 7.1 6.8
Level 3 | Common Equity/Interests/Warrants 7 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 18,724  
Level 3 | Common Equity/Interests/Warrants 7 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.100  
Level 3 | Common Equity/Interests/Warrants 7 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.200  
Level 3 | Common Equity/Interests/Warrants 7 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.150  
Level 3 | Common Equity/Interests/Warrants 7 | Asset recovery analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 12,077
Level 3 | Common Equity/Interests/Warrants 8 | Enterprise value waterfall (Market approach)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 3,128
Level 3 | Common Equity/Interests/Warrants 8 | Enterprise value waterfall (Market approach) | Minimum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.4
Level 3 | Common Equity/Interests/Warrants 8 | Enterprise value waterfall (Market approach) | Maximum | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   3.0
Level 3 | Common Equity/Interests/Warrants 8 | Enterprise value waterfall (Market approach) | Weighted Average | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   3.0
Level 3 | Common Equity/Interests/Warrants 8 | Asset recovery analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 12,008  
Level 3 | Common Equity/Interests/Warrants 9 | Discounted cash flow (Yield analysis)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value   $ 2
Level 3 | Common Equity/Interests/Warrants 9 | Discounted cash flow (Yield analysis) | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.215
Level 3 | Common Equity/Interests/Warrants 9 | Discounted cash flow (Yield analysis) | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.225
Level 3 | Common Equity/Interests/Warrants 9 | Discounted cash flow (Yield analysis) | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input   0.215
Level 3 | Common Equity/Interests/Warrants 9 | Option Pricing Model    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments at fair value $ 5,030  
Level 3 | Common Equity/Interests/Warrants 9 | Option Pricing Model | Minimum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.400  
Level 3 | Common Equity/Interests/Warrants 9 | Option Pricing Model | Maximum | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.400  
Level 3 | Common Equity/Interests/Warrants 9 | Option Pricing Model | Weighted Average | Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Input 0.400  
[1] Fair value is determined by or under the direction of our Board of Directors. Unless otherwise indicated by endnote 42 below, all of our investments are valued using significant unobservable inputs. In accordance with ASC 820, such investments are classified as Level 3 within the fair value hierarchy. See Notes 2 and 3 within the accompanying notes to consolidated financial statements for further discussion.
[2] Fair value is determined by or under the direction of our Board of Directors. Unless otherwise indicated by endnote 42 below, all of our investments are valued using significant unobservable inputs. In accordance with ASC 820, such investments are classified as Level 3 within the fair value hierarchy. See Notes 2 and 3 within the accompanying notes to consolidated financial statements for further discussion.