Fair Value of Investments - Schedule of Carrying and Fair Values of the Company’s Debt Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt obligations	$ 6,887,768	$ 6,909,235
Debt issuance costs, net	81,492	95,647
Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	7,077,088	7,281,744
Fair Value
Debt Instrument [Line Items]
Debt obligations	6,887,768	6,909,235
Level 1
Debt Instrument [Line Items]
Debt obligations	0	0
Level 2
Debt Instrument [Line Items]
Debt obligations	3,901,938	3,679,375
Level 3
Debt Instrument [Line Items]
Debt obligations	2,985,830	3,229,860
Line of Credit | SPV Asset Facility II
Debt Instrument [Line Items]
Debt issuance costs, net	4,300	4,600
Line of Credit | SPV Asset Facility II | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	245,728	245,368
Line of Credit | SPV Asset Facility II | Fair Value
Debt Instrument [Line Items]
Debt obligations	245,728	245,368
Line of Credit | SPV Asset Facility III
Debt Instrument [Line Items]
Debt issuance costs, net		600
Line of Credit | SPV Asset Facility III | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	0	249,372
Line of Credit | SPV Asset Facility III | Fair Value
Debt Instrument [Line Items]
Debt obligations	0	249,372
Line of Credit | CLO I
Debt Instrument [Line Items]
Debt issuance costs, net		2,700
Secured Debt | CLO I
Debt Instrument [Line Items]
Debt issuance costs, net	2,400	2,700
Secured Debt | CLO I | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	274,213	387,321
Secured Debt | CLO I | Fair Value
Debt Instrument [Line Items]
Debt obligations	274,213	387,321
Secured Debt | CLO II
Debt Instrument [Line Items]
Debt issuance costs, net	2,500	2,800
Secured Debt | CLO II | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	257,467	257,206
Secured Debt | CLO II | Fair Value
Debt Instrument [Line Items]
Debt obligations	257,467	257,206
Secured Debt | CLO III
Debt Instrument [Line Items]
Debt issuance costs, net	1,700	1,900
Secured Debt | CLO III | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	258,324	258,145
Secured Debt | CLO III | Fair Value
Debt Instrument [Line Items]
Debt obligations	258,324	258,145
Secured Debt | CLO IV
Debt Instrument [Line Items]
Debt issuance costs, net	4,300	4,700
Secured Debt | CLO IV | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	288,184	287,777
Secured Debt | CLO IV | Fair Value
Debt Instrument [Line Items]
Debt obligations	288,184	287,777
Secured Debt | CLO V
Debt Instrument [Line Items]
Debt issuance costs, net	2,600	2,800
Secured Debt | CLO V | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	507,000	506,792
Secured Debt | CLO V | Fair Value
Debt Instrument [Line Items]
Debt obligations	507,000	506,792
Secured Debt | CLO VI
Debt Instrument [Line Items]
Debt issuance costs, net	1,600	1,700
Secured Debt | CLO VI | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	258,425	258,271
Secured Debt | CLO VI | Fair Value
Debt Instrument [Line Items]
Debt obligations	258,425	258,271
Secured Debt | CLO VII
Debt Instrument [Line Items]
Debt issuance costs, net	1,900	2,000
Secured Debt | CLO VII | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	237,288	237,155
Secured Debt | CLO VII | Fair Value
Debt Instrument [Line Items]
Debt obligations	237,288	237,155
Secured Debt | CLO X
Debt Instrument [Line Items]
Debt issuance costs, net	1,900
Secured Debt | CLO X | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	258,126	0
Secured Debt | CLO X | Fair Value
Debt Instrument [Line Items]
Debt obligations	258,126	0
Unsecured debt | 2024 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	600	2,900
Unsecured debt | 2024 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	395,942	384,851
Unsecured debt | 2024 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	399,000	395,000
Unsecured debt | 2025 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	2,100	3,800
Unsecured debt | 2025 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	422,880	421,242
Unsecured debt | 2025 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	413,313	399,500
Unsecured debt | July 2025 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	2,900	4,700
Unsecured debt | July 2025 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	497,118	495,347
Unsecured debt | July 2025 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	478,750	462,500
Unsecured debt | 2026 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	4,700	6,800
Unsecured debt | 2026 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	495,320	493,162
Unsecured debt | 2026 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	483,750	461,250
Unsecured debt | July 2026 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	12,400	17,000
Unsecured debt | July 2026 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	987,597	982,993
Unsecured debt | July 2026 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	930,000	875,000
Unsecured debt | 2027 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	6,000	7,900
Unsecured debt | 2027 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	454,017	438,332
Unsecured debt | 2027 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	451,250	412,500
Unsecured debt | 2028 Notes
Debt Instrument [Line Items]
Debt issuance costs, net	11,600	14,000
Unsecured debt | 2028 Notes | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	838,384	835,957
Unsecured debt | 2028 Notes | Fair Value
Debt Instrument [Line Items]
Debt obligations	745,875	673,625
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt issuance costs, net	18,000	14,700
Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, net	18,000	14,700
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Net Carrying Value
Debt Instrument [Line Items]
Debt obligations	401,075	542,453
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Fair Value
Debt Instrument [Line Items]
Debt obligations	$ 401,075	$ 542,453