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Debt Obligations, Collateralized Loan Obligations (Details) $ in Thousands			1 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($) item tranche	Mar. 31, 2021 USD ($) tranche item	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Obligations
Debt, Carrying Value	$ 3,484,088			$ 3,484,088		$ 2,517,309
Weighted average note rate (as a percent)	2.32%			2.32%
Payoffs and paydowns of collateralized loan obligations				$ 356,150	$ 282,874
CLOs
Debt Obligations
Debt, Face Value	$ 3,506,080			3,506,080		2,532,343
Debt, Carrying Value	$ 3,484,088			$ 3,484,088		$ 2,517,309
Weighted average note rate (as a percent)	1.52%			1.52%		1.60%
Restricted cash related to interest payments, delayed funding and expenses	$ 38,100			$ 38,100		$ 49,500
Collateral Loans, Unpaid Principal	4,004,173			4,004,173		2,932,791
Collateral Loans, Carrying Value	4,004,173			4,004,173		2,932,791
Cash, Restricted Cash	178,060			178,060		138,683
Deferred financing fees	$ 22,000			$ 22,000		$ 15,000
Weighted average note rate including certain fees and costs (as a percent)	1.80%			1.80%		1.93%
CLO XV
Debt Obligations
Number of tranches of CLO notes issued | tranche	8
Number of newly-formed wholly-owned subsidiaries | item	2
Value of the tranches issued	$ 747,800			$ 747,800
Debt, Face Value	674,412			674,412
Debt, Carrying Value	$ 668,823			$ 668,823
Weighted average note rate (as a percent)	1.42%			1.42%
Collateral Loans, Unpaid Principal	$ 674,753			$ 674,753
Collateral Loans, Carrying Value	674,753			674,753
Cash, Restricted Cash	128,015			$ 128,015
Replacement period				2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations	$ 162,000
Maximum period to acquire additional loan obligations	180 days
Notional amount of residual interest retained	$ 140,600			$ 140,600
Value of portfolio loans as collateral	653,000			653,000
Face value of loan obligations will be owned by the issuer	$ 815,000			$ 815,000
Leverage (as a percent)	83.00%			83.00%
CLO XV | One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)	1.37%			1.37%
CLO XV | Investment grade
Debt Obligations
Debt, Face Value	$ 674,400			$ 674,400
CLO XV | Below investment grade
Debt Obligations
Debt, Carrying Value	73,400			73,400
Notional amount of residual interest retained	73,400			73,400
CLO XIV
Debt Obligations
Number of tranches of CLO notes issued | tranche		8
Number of newly-formed wholly-owned subsidiaries | item		2
Value of the tranches issued		$ 724,200	$ 724,200
Debt, Face Value	655,475			655,475
Debt, Carrying Value	$ 650,116			$ 650,116
Weighted average note rate (as a percent)	1.45%			1.45%
Collateral Loans, Unpaid Principal	$ 766,872			$ 766,872
Collateral Loans, Carrying Value	766,872			766,872
Replacement period			2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations		$ 149,800
Maximum period to acquire additional loan obligations		180 days
Notional amount of residual interest retained		$ 129,500	$ 129,500
Value of portfolio loans as collateral		635,200	635,200
Face value of loan obligations will be owned by the issuer		$ 785,000	$ 785,000
Leverage (as a percent)		84.00%	84.00%
CLO XIV | One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)		1.33%	1.33%
CLO XIV | Investment grade
Debt Obligations
Debt, Face Value		$ 655,500	$ 655,500
CLO XIV | Below investment grade
Debt Obligations
Debt, Carrying Value		68,700	68,700
Notional amount of residual interest retained		$ 68,700	68,700
CLO XIII
Debt Obligations
Debt, Face Value	668,000			668,000		$ 668,000
Debt, Carrying Value	$ 664,396			$ 664,396		$ 663,804
Weighted average note rate (as a percent)	1.54%			1.54%		1.58%
Collateral Loans, Unpaid Principal	$ 770,086			$ 770,086		$ 768,664
Collateral Loans, Carrying Value	770,086			770,086		768,664
Cash, Restricted Cash	17,749			17,749		43
CLO XII
Debt Obligations
Debt, Face Value	534,193			534,193		534,193
Debt, Carrying Value	$ 531,295			$ 531,295		$ 530,673
Weighted average note rate (as a percent)	1.62%			1.62%		1.66%
Collateral Loans, Unpaid Principal	$ 614,751			$ 614,751		$ 628,935
Collateral Loans, Carrying Value	614,751			614,751		628,935
Cash, Restricted Cash	15,412			15,412		2,005
CLO XI
Debt Obligations
Debt, Face Value	533,000			533,000		533,000
Debt, Carrying Value	$ 530,470			$ 530,470		$ 529,859
Weighted average note rate (as a percent)	1.56%			1.56%		1.61%
Collateral Loans, Unpaid Principal	$ 643,450			$ 643,450		$ 555,157
Collateral Loans, Carrying Value	643,450			643,450		555,157
Cash, Restricted Cash	884			884		92,395
CLO X
Debt Obligations
Debt, Face Value	441,000			441,000		441,000
Debt, Carrying Value	$ 438,988			$ 438,988		$ 438,442
Weighted average note rate (as a percent)	1.57%			1.57%		1.61%
Collateral Loans, Unpaid Principal	$ 534,261			$ 534,261		$ 522,132
Collateral Loans, Carrying Value	534,261			534,261		522,132
Cash, Restricted Cash	$ 16,000			$ 16,000		25,537
CLO IX
Debt Obligations
Debt, Face Value						356,150
Debt, Carrying Value						$ 354,531
Weighted average note rate (as a percent)						1.53%
Collateral Loans, Unpaid Principal						$ 457,903
Collateral Loans, Carrying Value						457,903
Cash, Restricted Cash						$ 18,703
Payoffs and paydowns of collateralized loan obligations			356,200
Deferred fees expensed as interest expense			$ 1,400

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Maximum period of time to acquire additional loan obligations, from the closing date of the CLO.

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The cash inflow from amounts received from issuance of collateralized loan obligations for the purpose of acquiring additional loan obligations.

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Notional amount of collateralized securitization vehicle residual interest retained.

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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

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