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Fair Value of Financial Instruments - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	$ 1,629,058	$ 1,706,556	$ 1,716,054	$ 1,632,922
Investments purchased	111,557	179,201	188,242	322,741
Accretion of discount	2,601	2,478	6,943	4,974
Sales and principal repayments	(87,971)	(109,553)	(200,231)	(170,585)
Ending balance	1,660,246	1,760,395	1,660,246	1,760,395
Change in net unrealized appreciation (depreciation) on investments	6,732	(21,338)	(31,031)	(31,058)
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	(18,928)	180	(23,453)	111
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	23,929	(18,467)	(27,309)	(29,768)
Senior Secured First Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,472,453	1,597,364	1,579,512	1,526,989
Investments purchased	77,961	175,707	118,713	317,499
Accretion of discount	2,541	2,131	6,810	4,535
Sales and principal repayments	(87,870)	(93,196)	(200,045)	(154,038)
Ending balance	1,468,630	1,660,828	1,468,630	1,660,828
Change in net unrealized appreciation (depreciation) on investments	5,280	(21,519)	(22,169)	(34,992)
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	(13,163)	(34)	(17,674)	(107)
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	16,708	(21,144)	(18,686)	(34,050)
Senior Secured Second Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	38,997	36,875	38,769	38,583
Investments purchased	0	1,836	0	1,836
Accretion of discount	56	344	125	432
Sales and principal repayments	(5)	(15,000)	(9)	(15,000)
Ending balance	39,544	27,086	39,544	27,086
Change in net unrealized appreciation (depreciation) on investments	496	525	659	873
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	10	0	14
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	496	3,021	659	1,221
Collateralized securities and structured products - equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,133	2,632	1,179	2,998
Investments purchased	0	0	0	0
Accretion of discount	0	0	0	0
Sales and principal repayments	(96)	(854)	(177)	(1,044)
Ending balance	1,046	1,602	1,046	1,602
Change in net unrealized appreciation (depreciation) on investments	9	(176)	44	(352)
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	0	0	0
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	9	(176)	44	(352)
Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	15,517	27,280	22,643	26,616
Investments purchased	4,200	650	4,200	1,273
Accretion of discount	4	3	8	7
Sales and principal repayments	0	0	0	0
Ending balance	17,301	27,994	17,301	27,994
Change in net unrealized appreciation (depreciation) on investments	(2,420)	61	(9,550)	98
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
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	(2,420)	61	(9,550)	98
Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	100,958	42,405	73,951	37,736
Investments purchased	29,396	1,008	65,329	2,133
Accretion of discount	0	0	0	0
Sales and principal repayments	0	(503)	0	(503)
Ending balance	133,725	42,885	133,725	42,885
Change in net unrealized appreciation (depreciation) on investments	3,367	(229)	(15)	3,315
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	(5,765)	204	(5,779)	204
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	$ 9,136	$ (229)	$ 224	$ 3,315

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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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