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Fair Value of Financial Instruments - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax	Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax	Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax	Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,660,246	$ 1,760,395	$ 1,716,054	$ 1,632,922
Investments purchased	146,798	193,554	335,040	516,295
Accretion of discount	3,899	4,191	10,842	9,165
Sales and principal repayments	(127,928)	(200,034)	(328,159)	(370,619)
Ending balance	1,701,036	1,759,742	1,701,036	1,759,742
Change in net unrealized appreciation (depreciation) on investments	5,013	(8,075)	(13,507)	(39,778)
Total | Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	(8,123)	(17,166)	(31,576)	(17,055)
Total | Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	26,144	18,802	(1,165)	(10,966)
Senior Secured First Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,468,630	1,660,828	1,579,512	1,526,989
Investments purchased	112,470	142,620	231,183	460,119
Accretion of discount	3,847	4,170	10,657	8,705
Sales and principal repayments	(127,838)	(199,103)	(327,883)	(353,141)
Ending balance	1,481,498	1,616,352	1,481,498	1,616,352
Change in net unrealized appreciation (depreciation) on investments	10,453	(7,793)	1,685	(43,281)
Senior Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	(5,844)	10,452	(23,518)	10,345
Senior Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	30,233	(2,615)	11,547	(36,665)
Senior Secured Second Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	39,544	27,086	38,769	38,583
Investments purchased	0	18,109	0	19,945
Accretion of discount	47	17	172	449
Sales and principal repayments	(4)	(536)	(13)	(15,536)
Ending balance	36,114	38,716	36,114	38,716
Change in net unrealized appreciation (depreciation) on investments	(3,473)	(3)	(2,814)	798
Senior Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	0	(19,339)	0	(19,325)
Senior Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	(3,473)	13,379	(2,814)	14,600
Collateralized securities and structured products - equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,046	1,602	1,179	2,998
Investments purchased	0	0	0	0
Accretion of discount	0	0	0	0
Sales and principal repayments	(86)	(132)	(263)	(1,176)
Ending balance	1,224	1,366	1,224	1,366
Change in net unrealized appreciation (depreciation) on investments	264	(128)	308	(480)
Collateralized securities and structured products - equity | Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	0	24	0	24
Collateralized securities and structured products - equity | Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	264	(128)	308	(480)
Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	17,301	27,994	22,643	26,616
Investments purchased	0	677	4,200	1,950
Accretion of discount	5	4	13	11
Sales and principal repayments	0	0	0	0
Ending balance	14,631	28,319	14,631	28,319
Change in net unrealized appreciation (depreciation) on investments	(2,675)	(356)	(12,225)	(257)
Unsecured debt | Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	0	0	0	0
Unsecured debt | Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	(2,675)	(356)	(12,225)	(258)
Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	133,725	42,885	73,951	37,736
Investments purchased	34,328	32,148	99,657	34,281
Accretion of discount	0	0	0	0
Sales and principal repayments	0	(263)	0	(766)
Ending balance	167,569	74,989	167,569	74,989
Change in net unrealized appreciation (depreciation) on investments	444	205	(461)	3,442
Equity | Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	(2,279)	(8,303)	(8,058)	(8,099)
Equity | Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings	$ 1,795	$ 8,522	$ 2,019	$ 11,837

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion Of Discount

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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