Transactions with Affiliate Companies - Schedule of Income Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	$ 120,227	$ 87,914	$ 224,126	$ 164,988
Other income	375	2,559	830	2,660
Non-controlled affiliate company investments
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			4,696	2,445
Dividend income			781	0
Other income	$ 42	$ 0	42	0
Non-controlled affiliate company investments | Baystate Sewage Disposal, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			1	0
Dividend income			2	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			33	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			197	217
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			779	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	208
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			501	409
Dividend income			0	0
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			130	0
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			496	502
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			598	227
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			1,769	0
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			99	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			872	882
Dividend income			0	0
Other income			0	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			1
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			2
Other income			0
Investment, Identifier [Axis]: Baystate Sewage Disposal, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			0
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			0
Dividend income			0
Other income			0
Investment, Identifier [Axis]: ClearlyRated Capital, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			32
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			1
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			779
Other income			0
Investment, Identifier [Axis]: Nastel Technologies, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			196	217
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			130
Dividend income			0
Other income			0
Investment, Identifier [Axis]: SFR Holdco 2, LLC (LLC interest)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			0
Dividend income			0
Other income
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			296	233
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			205	176
Dividend income			0	0
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				208
Dividend income				0
Other income				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			57	67
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			343	358
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			96	77
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			570	226
Dividend income			0	0
Other income			0	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			28	1
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			1,546
Dividend income			0
Other income			0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			133
Dividend income			0
Other income			0
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			90
Dividend income			0
Other income			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
Dividend income			0
Other income			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
Dividend income			0
Other income			0
Investment, Identifier [Axis]: YBR OZ ECE, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income			94
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			5
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			809	876
Dividend income			0	0
Other income			0	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			63	6
Dividend income			0	0
Other income			$ 0	$ 0