BORROWINGS - Narrative (Details)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Oct. 13, 2025
USD ($)
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Dec. 09, 2024
USD ($)
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Nov. 04, 2024
USD ($)
trading_day
consecutive_trading_day
$ / shares
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Mar. 20, 2024
USD ($)
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Mar. 01, 2024 |
Aug. 02, 2023
USD ($)
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Apr. 20, 2021
USD ($)
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Sep. 30, 2025
USD ($)
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Dec. 31, 2025
USD ($)
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Dec. 31, 2024
USD ($)
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Mar. 31, 2026
USD ($)
lender
facility
$ / shares
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Mar. 31, 2025
USD ($)
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Mar. 31, 2024
USD ($)
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Jun. 20, 2024
USD ($)
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Jun. 19, 2024
USD ($)
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Aug. 01, 2023
USD ($)
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Jun. 30, 2023
USD ($)
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Nov. 30, 2021
USD ($)
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Aug. 31, 2021
USD ($)
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Feb. 28, 2021
USD ($)
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Dec. 31, 2020
USD ($)
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Apr. 25, 2019 |
| Debt Instrument [Line Items] |
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| Asset coverage ratio |
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166.00%
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| Current asset coverage ratio |
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209.00%
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| Leverage commitment amount drawn |
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$ 1,148,000,000
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$ 969,875,000
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| January 2026 Notes | Notes |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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0.00%
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4.46%
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4.46%
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| Aggregate principal amount |
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$ 65,000,000.0
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$ 75,000,000.0
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| Fixed interest rate (in percent) |
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4.50%
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| Issuance price percent received |
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102.11%
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| Yield-to-maturity (in percent) |
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4.00%
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| Repurchased face amount |
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$ 140,000,000.0
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| Redemption price, percentage |
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100.00%
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| Realized loss on disposal of fixed assets |
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$ 400,000
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| October 2026 Notes | Notes |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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3.50%
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3.50%
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3.50%
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| Aggregate principal amount |
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$ 50,000,000.0
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$ 100,000,000.0
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| Fixed interest rate (in percent) |
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3.375%
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3.375%
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| Issuance price percent received |
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99.993%
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99.418%
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| Yield-to-maturity (in percent) |
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3.375%
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3.50%
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| Repurchased face amount |
$ 150,000,000.0
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| Redemption price, percentage |
100.00%
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| Realized loss on disposal of fixed assets |
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$ 800,000
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| Leverage commitment amount drawn |
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$ 150,000,000
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| October 2026 Notes | Convertible Debt |
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| Debt Instrument [Line Items] |
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| Fixed interest rate (in percent) |
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5.125%
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| August 2028 Notes | Notes |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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7.75%
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7.75%
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7.75%
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| Aggregate principal amount |
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$ 71,900,000
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| Fixed interest rate (in percent) |
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7.75%
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| Repurchased face amount |
$ 71,900,000
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| Redemption price, percentage |
100.00%
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| Realized loss on disposal of fixed assets |
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$ 1,400,000
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| Leverage commitment amount drawn |
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$ 71,875,000
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| August 2028 Notes Overallotment | Notes |
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| Debt Instrument [Line Items] |
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| Aggregate principal amount |
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$ 9,400,000
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| 2029 Convertible Notes | Convertible Debt |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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5.13%
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5.13%
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0.00%
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| Aggregate principal amount |
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$ 230,000,000.0
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| Fixed interest rate (in percent) |
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5.125%
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| Redemption price, percentage |
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100.00%
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| Conversion rate |
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0.04
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40.66
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| Conversion price (in usd per share) | $ / shares |
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$ 25.00
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$ 24.60
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| Dividend increase (in usd per share) | $ / shares |
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$ 0.58
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| Percentage of stock price |
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130.00%
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| Trading days | trading_day |
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20
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| Consecutive trading days | consecutive_trading_day |
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30
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| Leverage commitment amount drawn |
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$ 230,000,000
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$ 230,000,000
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| 2029 Convertible Notes | Convertible Debt | Maximum |
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| Debt Instrument [Line Items] |
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| Conversion rate |
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0.0447828
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| 2029 Convertible Notes Overallotement | Convertible Debt |
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| Debt Instrument [Line Items] |
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| Aggregate principal amount |
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$ 30,000,000.0
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| September 2030 Notes | Notes |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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5.95%
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0.00%
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0.00%
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| Aggregate principal amount |
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$ 350,000,000.0
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| Fixed interest rate (in percent) |
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5.95%
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| Issuance price percent received |
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99.345%
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| Yield-to-maturity (in percent) |
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6.104%
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| Redemption price, percentage |
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100.00%
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| Leverage commitment amount drawn |
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$ 350,000,000
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| SBA Debentures | Unsecured Debt |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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4.43%
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4.40%
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4.18%
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| Leverage commitment amount drawn |
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$ 223,000,000
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$ 175,000,000
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| SBA Debentures | Unsecured Debt | SBIC I |
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| Debt Instrument [Line Items] |
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| Maturity (in years) |
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10 years
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| Regulatory maximum borrowing capacity |
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$ 175,000,000
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| Regulatory capital |
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$ 87,500,000
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87,500,000
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| Available leverage commitment |
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87,500,000
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| Leverage commitment amount drawn |
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175,000,000.0
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| Leverage commitment amount |
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175,000,000.0
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| SBA Debentures | Unsecured Debt | SBIC II |
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| Debt Instrument [Line Items] |
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| Regulatory capital |
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87,500,000
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| Available leverage commitment |
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50,000,000.0
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| Leverage commitment amount drawn |
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48,000,000.0
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| Leverage commitment amount |
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$ 90,000,000.0
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| Corporate Credit Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Weighted average interest rate |
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6.50%
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7.33%
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| Average borrowings |
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$ 310,800,000
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$ 269,800,000
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| Corporate Credit Facility | Corporate Credit Facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Number of revolving credit facility | facility |
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1
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| Weighted average interest rate |
|
|
|
|
|
|
|
|
|
|
6.43%
|
7.33%
|
7.66%
|
|
|
|
|
|
|
|
|
|
| Average borrowings |
|
|
|
|
|
|
|
|
|
|
$ 202,329,000
|
$ 186,274,000
|
$ 217,500,000
|
|
|
|
|
|
|
|
|
|
| Basis spread on variable rate |
|
|
|
|
|
2.15%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Maximum borrowing capacity |
|
|
|
|
|
$ 435,000,000
|
|
|
|
|
$ 510,000,000
|
|
|
|
|
$ 400,000,000
|
|
|
|
|
|
|
| Accordion feature increase limit |
|
|
|
|
|
$ 750,000,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Number of lenders | lender |
|
|
|
|
|
|
|
|
|
|
11
|
|
|
|
|
|
|
|
|
|
|
|
| Minimum senior coverage ratio |
|
|
|
|
2.00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Maximum asset coverage ratio |
|
|
|
|
1.50
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Interest coverage ratio |
|
|
|
|
2.00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Leverage commitment amount drawn |
|
|
|
|
|
|
|
|
|
|
$ 245,000,000
|
$ 235,000,000
|
|
|
|
|
|
|
|
|
|
|
| Corporate Credit Facility | Corporate Credit Facility | Line of Credit | Minimum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Commitment fee percentage |
|
|
|
|
0.50%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Corporate Credit Facility | Corporate Credit Facility | Line of Credit | Maximum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Commitment fee percentage |
|
|
|
|
1.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| SPV Credit Facility | SPV Credit Facility | Line of Credit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Number of revolving credit facility | facility |
|
|
|
|
|
|
|
|
|
|
1
|
|
|
|
|
|
|
|
|
|
|
|
| Weighted average interest rate |
|
|
|
|
|
|
|
|
|
|
6.64%
|
7.32%
|
0.00%
|
|
|
|
|
|
|
|
|
|
| Average borrowings |
|
|
|
|
|
|
|
|
|
|
$ 108,479,000
|
$ 83,534,000
|
$ 0
|
|
|
|
|
|
|
|
|
|
| Maximum borrowing capacity |
|
|
|
$ 150,000,000.0
|
|
|
|
|
|
|
|
|
|
|
$ 150,000,000.0
|
|
|
|
|
|
|
|
| Accordion feature increase limit |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 200,000,000.0
|
|
|
|
|
|
|
|
|
| Accordion feature that allows increases (up to) |
|
|
|
$ 400,000,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Leverage commitment amount drawn |
|
|
|
|
|
|
|
|
|
|
$ 100,000,000
|
$ 108,000,000
|
|
|
|
|
|
|
|
|
|
|
| SPV Credit Facility | SPV Credit Facility | Line of Credit | Before March 20 2027 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Basis spread on variable rate |
|
|
|
2.50%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| SPV Credit Facility | SPV Credit Facility | Line of Credit | After March 20 2027 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Basis spread on variable rate |
|
|
|
2.85%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| SPV Credit Facility | SPV Credit Facility | Line of Credit | Before April 20 2024 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Commitment fee percentage |
|
|
|
0.10%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| SPV Credit Facility | SPV Credit Facility | Line of Credit | After April 20 2024 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Commitment fee percentage |
|
|
|
0.35%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|