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Fair Value Measures and Disclosures - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,760,395	$ 1,660,894	$ 1,632,922	$ 1,468,282
Investments purchased	193,554	171,094	516,295	590,309
Accretion of discount	4,191	3,360	9,165	9,265
Sales and principal repayments	(200,034)	(226,383)	(370,619)	(499,388)
Ending balance	1,759,742	1,614,136	1,759,742	1,614,136
Change in net unrealized (depreciation) appreciation on investments still held	(8,075)	9,358	(39,778)	35,475
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	(17,166)	19,729	(17,055)	19,120
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	18,802	(14,558)	(10,966)	26,548
Senior Secured First Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,660,828	1,407,224	1,526,989	1,223,268
Investments purchased	142,620	167,208	460,119	580,641
Accretion of discount	4,170	3,185	8,705	8,742
Sales and principal repayments	(199,103)	(147,549)	(353,141)	(400,843)
Ending balance	1,616,352	1,428,556	1,616,352	1,428,556
Change in net unrealized (depreciation) appreciation on investments still held	(7,793)	(430)	(43,281)	14,459
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	10,452	563	10,345	(851)
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	(2,615)	(2,075)	(36,665)	17,599
Senior Secured Second Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	27,086	141,710	38,583	151,506
Investments purchased	18,109	244	19,945	1,885
Accretion of discount	17	171	449	512
Sales and principal repayments	(536)	(42,784)	(15,536)	(55,615)
Ending balance	38,716	99,499	38,716	99,499
Change in net unrealized (depreciation) appreciation on investments still held	(3)	140	798	(880)
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	(19,339)	619	(19,325)	619
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	13,379	(461)	14,600	592
Collateralized Securities and Structured Products - Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,602	14,095	2,998	12,131
Investments purchased	0	0	0	0
Accretion of discount	0	0	0	0
Sales and principal repayments	(132)	(900)	(1,176)	(1,718)
Ending balance	1,366	13,012	1,366	13,012
Change in net unrealized (depreciation) appreciation on investments still held	(128)	(536)	(480)	1,962
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	24	(309)	24	(309)
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	(128)	126	(480)	2,908
Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	27,994	5,508	26,616	5,464
Investments purchased	677	0	1,950	0
Accretion of discount	4	4	11	11
Sales and principal repayments	0	0	0	0
Ending balance	28,319	5,551	28,319	5,551
Change in net unrealized (depreciation) appreciation on investments still held	(356)	39	(257)	76
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	(356)	39	(258)	76
Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	42,885	92,357	37,736	75,913
Investments purchased	32,148	3,642	34,281	7,783
Accretion of discount	0	0	0	0
Sales and principal repayments	(263)	(35,150)	(766)	(41,212)
Ending balance	74,989	67,518	74,989	67,518
Change in net unrealized (depreciation) appreciation on investments still held	205	10,145	3,442	19,858
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	(8,303)	18,856	(8,099)	19,661
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	$ 8,522	$ (12,187)	$ 11,837	$ 5,373

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