Fair Value of Financial Instruments - Schedule of Carrying and Fair Values of the Company’s Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	$ 2,489,272	$ 2,026,352
Unamortized Debt Issuance Costs	46,521	26,047
Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	2,490,811	2,025,308
Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	2,489,272	2,026,352
Level 1
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	0	0
Level 2
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	703,500	0
Level 3
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	1,785,772	2,026,352
Line of Credit | Subscription Credit Facility
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	843	2,546
Line of Credit | Subscription Credit Facility | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	534,157	797,454
Line of Credit | Subscription Credit Facility | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	534,157	797,454
Line of Credit | SPV Asset Facility I
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	12,119	8,613
Line of Credit | SPV Asset Facility I | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	300,381	321,387
Line of Credit | SPV Asset Facility I | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	300,381	321,387
Line of Credit | SPV Asset Facility II
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	(3,609)
Unamortized Debt Issuance Costs	3,609	2,353
Line of Credit | SPV Asset Facility II | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value		267,647
Net Carrying Value/Fair Value	(3,609)
Line of Credit | SPV Asset Facility II | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value		267,647
Net Carrying Value/Fair Value	(3,609)
Secured Debt | Athena CLO II | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	285,737	285,596
Secured Debt | Athena CLO II | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	285,737	285,596
Secured Debt | Athena CLO IV
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs		0
Secured Debt | Athena CLO IV | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	237,400	0
Secured Debt | Athena CLO IV | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value		0
Secured Debt | April 2029 Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	15,664
Unsecured debt investments | Athena CLO II
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	2,263	2,404
Unsecured debt investments | Athena CLO IV
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	2,600
Unsecured debt investments | Athena CLO IV | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	237,400
Unsecured debt investments | 2023A Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	720	856
Unsecured debt investments | 2023A Notes | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	74,280	74,144
Unsecured debt investments | 2023A Notes | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	75,000	75,188
Unsecured debt investments | April 2029 Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs		0
Unsecured debt investments | April 2029 Notes | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	705,759	0
Unsecured debt investments | April 2029 Notes | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	703,500	0
Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	8,703	9,275
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Net Carrying Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	356,706	279,080
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Fair Value
Debt Instrument [Line Items]
Net Carrying Value/Fair Value	$ 356,706	$ 279,080