Transactions with Affiliate Companies - Schedule of Income Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	$ 483,019	$ 365,634	$ 207,338
Other income	2,506	10,887	2,184
Non-controlled affiliate company investments
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	10,233	6,152
Dividend income	4,755	50
Other income	63	0	$ 165
Non-controlled affiliate company investments \| Baystate Sewage Disposal, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	242	0
Dividend income	358	0
Other income	0	0
Non-controlled affiliate company investments \| Born To Run, LLC.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| ClearlyRated Capital (Class A Units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	115	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| Engineered Metal Solutions, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	193	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| Jumpstart Holdco, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| MC Aviation Limited
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| MC Voyager SPV II LLC (Equity Commitment)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| Nastel Technologies, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	385	430
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| NFS Intermediate Holdco, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	4,397	0
Other income	0	0
Non-controlled affiliate company investments \| Second Avenue S F R Holdings I I L L C
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	330
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| S F R Holdco, L L C
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,003	1,021
Dividend income	0	50
Other income	0	0
Non-controlled affiliate company investments \| S F R Holdco 2, L L C
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	307	25
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| SheerTrans Solutions, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	994	1,030
Dividend income	0	0
Other income	42	0
Non-controlled affiliate company investments \| Summit Professional Education, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,391	865
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| Triad Financial Services, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| Whistler Parent Holdings III, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	3,642	660
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| YBR OZ ECE, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	226	0
Dividend income	0	0
Other income	0	0
Non-controlled affiliate company investments \| Zodega Landscaping, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,735	1,791
Dividend income	0	0
Other income	21	0
Investment, Identifier [Axis]: BTR Opco LLC (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: BTR Opco LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: BTR Opco LLC 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: BTR Opco LLC 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Baystate Sewage Disposal, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	234
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Baystate Sewage Disposal, LLC (Class A-1 preferred units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	358
Other income	0
Investment, Identifier [Axis]: Baystate Sewage Disposal, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	6
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Baystate Sewage Disposal, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	2
Dividend income	0
Other income	0
Investment, Identifier [Axis]: ClearlyRated Capital, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	112
Dividend income	0
Other income	0
Investment, Identifier [Axis]: ClearlyRated Capital, LLC (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: ClearlyRated Capital, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	3
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Engineered Metal Solutions, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	189
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Engineered Metal Solutions, Inc. (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Engineered Metal Solutions, Inc. (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	4
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Jumpstart Holdco, Inc. (Class A common units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Jumpstart Holdco, Inc. (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Jumpstart Holdco, Inc. (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Jumpstart Holdco, Inc. (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: MC Aviation Limited (Commitment to purchase the equity) \| Equity Securities
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: MC Voyager SPV II LLC (Equity commitment)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: NFS Intermediate HoldCo, LLC (Series B preferred units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	4,397
Other income	0
Investment, Identifier [Axis]: Nastel Technologies, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	384	430
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Nastel Technologies, LLC (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Nastel Technologies, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SFR Holdco 2, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	307	25
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SFR Holdco 2, LLC (LLC interest)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income		0
Investment, Identifier [Axis]: SFR Holdco, LLC (LLC interest) 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SFR Holdco, LLC (LLC interest) 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SFR Holdco, LLC 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	593	656
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SFR Holdco, LLC 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	410	365
Dividend income	0	50
Other income	0	0
Investment, Identifier [Axis]: Second Avenue SFR Holdings II LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income		330
Dividend income		0
Other income		0
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (Class A Preferred interests)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (Class B Preferred interests)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (Preferred interests)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	98	134
Dividend income	0	0
Other income	8	0
Investment, Identifier [Axis]: SheerTrans Solutions, LLC 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	700	717
Dividend income	0	0
Other income	26	0
Investment, Identifier [Axis]: SheerTrans Solutions, LLC 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	196	179
Dividend income	0	0
Other income	8	0
Investment, Identifier [Axis]: Summit Professional Education, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	18
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Summit Professional Education, LLC (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Summit Professional Education, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	36	27
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Summit Professional Education, LLC 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	204
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Summit Professional Education, LLC 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,133	838
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Triad Financial Services, Inc. (Equity commitment)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	3,083	581
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	253	34
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Series A preferred stock)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Series B preferred stock)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	306	45
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: YBR OZ ECE, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	197
Dividend income	0
Other income	0
Investment, Identifier [Axis]: YBR OZ ECE, LLC (Class A units)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: YBR OZ ECE, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	29
Dividend income	0
Other income	0
Investment, Identifier [Axis]: YBR OZ ECE, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0
Dividend income	0
Other income	0
Investment, Identifier [Axis]: Zodega Landscaping, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,609	1,730
Dividend income	0	0
Other income	18	0
Investment, Identifier [Axis]: Zodega Landscaping, LLC (Preferred interests)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend income	0	0
Other income	0	0
Investment, Identifier [Axis]: Zodega Landscaping, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	126	61
Dividend income	0	0
Other income	$ 3	$ 0