Fair Value of Financial Instruments - Schedule of Carrying and Fair Values of the Company’s Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Net Carrying Value	$ 6,865,735	$ 6,291,450
Debt Issuance Costs	(86,197)	(84,123)
Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	6,904,332	6,288,200
Fair Value
Debt Instrument [Line Items]
Net Carrying Value	6,865,735	6,291,450
Level 1
Debt Instrument [Line Items]
Net Carrying Value	0	0
Level 2
Debt Instrument [Line Items]
Net Carrying Value	2,449,125	2,108,875
Level 3
Debt Instrument [Line Items]
Net Carrying Value	4,416,610	4,182,575
Line of Credit \| SPV Asset Facility I
Debt Instrument [Line Items]
Debt Issuance Costs	(8,188)	(8,398)
Line of Credit \| SPV Asset Facility I \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	691,812	691,602
Line of Credit \| SPV Asset Facility I \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	691,812	691,602
Line of Credit \| SPV Asset Facility II
Debt Instrument [Line Items]
Debt Issuance Costs	(4,148)	(4,536)
Line of Credit \| SPV Asset Facility II \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	320,852	320,464
Line of Credit \| SPV Asset Facility II \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	320,852	320,464
Line of Credit \| SPV Asset Facility III
Debt Instrument [Line Items]
Debt Issuance Costs	(9,964)	(11,413)
Line of Credit \| SPV Asset Facility III \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	614,536	613,087
Line of Credit \| SPV Asset Facility III \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	614,536	613,087
Line of Credit \| SPV Asset Facility IV
Debt Instrument [Line Items]
Debt Issuance Costs	(5,162)	(5,654)
Line of Credit \| SPV Asset Facility IV \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	264,838	194,346
Line of Credit \| SPV Asset Facility IV \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	264,838	194,346
Secured Debt \| Athena CLO II
Debt Instrument [Line Items]
Debt Issuance Costs	(4,007)	(3,932)
Secured Debt \| Athena CLO II \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	370,993	371,068
Secured Debt \| Athena CLO II \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	370,993	371,068
Secured Debt \| Athena CLO IV
Debt Instrument [Line Items]
Debt Issuance Costs	(2,296)	(2,346)
Secured Debt \| Athena CLO IV \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	237,704	237,654
Secured Debt \| Athena CLO IV \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	237,704	237,654
Secured Debt \| Athena CLO V
Debt Instrument [Line Items]
Debt Issuance Costs	(1,829)	(1,928)
Secured Debt \| Athena CLO V \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	298,171	298,072
Secured Debt \| Athena CLO V \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	298,171	298,072
Unsecured debt investments \| June 2026 Notes
Debt Instrument [Line Items]
Debt Issuance Costs	(329)	(713)
Unsecured debt investments \| June 2026 Notes \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	374,671	374,287
Unsecured debt investments \| June 2026 Notes \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	373,125	373,125
Unsecured debt investments \| January 2027 Notes
Debt Instrument [Line Items]
Debt Issuance Costs	(1,237)	(1,621)
Unsecured debt investments \| January 2027 Notes \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	298,763	298,379
Unsecured debt investments \| January 2027 Notes \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	291,000	291,750
Unsecured debt investments \| March 2028 Notes
Debt Instrument [Line Items]
Debt Issuance Costs	(6,977)	(7,811)
Unsecured debt investments \| March 2028 Notes \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	650,515	654,890
Unsecured debt investments \| March 2028 Notes \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	643,500	653,250
Unsecured debt investments \| September 2028 Notes
Debt Instrument [Line Items]
Debt Issuance Costs	(450)	(495)
Unsecured debt investments \| September 2028 Notes \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	74,550	74,505
Unsecured debt investments \| September 2028 Notes \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	75,000	75,000
Unsecured debt investments \| April 2029 Notes
Debt Instrument [Line Items]
Debt Issuance Costs	(10,729)	(11,558)
Unsecured debt investments \| April 2029 Notes \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	698,743	703,564
Unsecured debt investments \| April 2029 Notes \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	689,500	715,750
Unsecured debt investments \| Interest rate swaps January 2031 Notes
Debt Instrument [Line Items]
Debt Issuance Costs	(8,585)	0
Unsecured debt investments \| Interest rate swaps January 2031 Notes \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	390,480	0
Unsecured debt investments \| Interest rate swaps January 2031 Notes \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	377,000	0
Revolving loan commitments \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt Issuance Costs	(22,296)	(23,718)
Revolving loan commitments \| Line of Credit \| Revolving Credit Facility \| Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value	1,617,704	1,456,282
Revolving loan commitments \| Line of Credit \| Revolving Credit Facility \| Fair Value
Debt Instrument [Line Items]
Net Carrying Value	$ 1,617,704	$ 1,456,282