Amount of collateralized loan obligation.

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Face (par) amount of tranches issued to fund a collateralized securitization vehicle.

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Represents the replacement period of financing that allows the principal proceeds and sale proceeds (if any) of the loan obligations to be reinvested in qualifying replacement loan obligations.

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Represents the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding, including certain fees and costs.

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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 principal balance of the securities sold under agreements to repurchase and borrowings under warehouse and revolving lines of credit.

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Amount of amortization expense attributable to debt issuance costs.

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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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Amount of assets pledged to secure a debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Debt Obligations - Collateralized Loan Obligations (Details)	1 Months Ended			12 Months Ended
	May 31, 2022 USD ($) tranche subsidiary	Feb. 28, 2022 USD ($) subsidiary tranche	Dec. 31, 2021 USD ($) tranche item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) item tranche	Dec. 31, 2020 USD ($) tranche item	Dec. 31, 2019 USD ($) item tranche
Debt Obligations
Proceeds from issuance of securitized debt				$ 2,762,502,000	$ 4,281,512,000	$ 668,000,000
Securitized debt			$ 5,892,810,000	$ 7,849,270,000	$ 5,892,810,000
Weighted average rate (as a percent)			2.21%	6.54%	2.21%
Payoffs and paydowns of collateralized loan obligations				$ 801,141,000	$ 889,150,000	283,125,000
Credit and repurchase facilities, Principal/Notional Amount			$ 4,493,699,000	$ 3,856,009,000	$ 4,493,699,000
Repayment of debt						$ 70,000,000
Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			2.34%	6.59%	2.34%
Deferred financing fees			$ 7,700,000	$ 13,300,000	$ 7,700,000
Weighted average note rate including certain fees and costs (as a percent)			2.51%	6.95%	2.51%
Leverage (as a percent)			77.00%	73.00%	77.00%
Credit and repurchase facilities, Principal/Notional Amount			$ 3,533,016,000	$ 3,549,694,000	$ 3,533,016,000
Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			1.75%	5.96%	1.75%
Deferred financing fees			$ 4,400,000	$ 900,000	$ 4,400,000
Credit and repurchase facilities, Principal/Notional Amount			960,683,000	306,315,000	960,683,000
Secured Debt [Member]
Debt Obligations
Notional amount of secured floating rate notes				$ 315,800,000
Leverage (as a percent)				75.00%
Collateralized loan obligations
Debt Obligations
Debt, Face Value (UPB)				$ 7,649,188,000
Securitized debt				$ 7,615,364,000
Weighted average rate (as a percent)				6.10%
Collateral Loans, Unpaid Principal				$ 8,619,210,000
Collateral Loans, Carrying Value				8,586,139,000
Cash, Restricted Cash				480,817,000
Deferred financing fees			$ 31,900,000	$ 36,800,000	$ 31,900,000
Weighted average note rate including certain fees and costs (as a percent)			1.86%	6.32%	1.86%
Collateral at risk			$ 0	$ 0	$ 0
CLO 19
Debt Obligations
Number of tranches of CLO notes issued \| tranche	9
Number of newly-formed wholly-owned subsidiaries \| subsidiary	1
Value of the tranches issued	$ 1,050,000,000.00
Debt, Face Value (UPB)	$ 872,800,000			872,812,000
Securitized debt				$ 866,605,000
Weighted average rate (as a percent)				6.75%
Collateral Loans, Unpaid Principal				$ 952,268,000
Collateral Loans, Carrying Value				947,336,000
Cash, Restricted Cash				64,300,000
Replacement period	2 years
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations	$ 73,100,000
Maximum period to acquire additional loan obligations	180 days
Weighted average note rate including certain fees and costs (as a percent)	2.36%
Value of portfolio loans and cash as collateral	$ 976,900,000
Face value of loan obligations will be owned by the issuer	$ 1,050,000,000.00
Leverage (as a percent)	83.00%
Credit and repurchase facilities, Principal/Notional Amount	$ 177,200,000
CLO 18
Debt Obligations
Number of tranches of CLO notes issued \| tranche		8
Number of newly-formed wholly-owned subsidiaries \| subsidiary		2
Proceeds from issuance of securitized debt		$ 1,860,000,000
Debt, Face Value (UPB)		1,650,000,000		1,652,812,000
Securitized debt		$ 210,100,000		$ 1,645,711,000
Weighted average rate (as a percent)				6.19%
Collateral Loans, Unpaid Principal				$ 1,899,174,000
Collateral Loans, Carrying Value				1,891,215,000
Cash, Restricted Cash				85,970,000
Replacement period		2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations		$ 347,300,000
Maximum period to acquire additional loan obligations		180 days
Notional amount of residual interest retained		$ 397,200,000
Value of portfolio loans and cash as collateral		1,700,000,000
Face value of loan obligations will be owned by the issuer		$ 2,050,000,000.00
Leverage (as a percent)		81.00%
CLO 18 \| One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)		1.81%
CLO 18 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained		$ 210,100,000
CLO 17
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			$ 1,910,000,000		1,910,000,000
Debt, Face Value (UPB)			1,714,125,000	1,714,125,000	1,714,125,000
Securitized debt			$ 1,705,549,000	$ 1,707,676,000	$ 1,705,549,000
Weighted average rate (as a percent)			1.81%	6.16%	1.81%
Collateral Loans, Unpaid Principal			$ 1,914,280,000	$ 1,911,866,000	$ 1,914,280,000
Collateral Loans, Carrying Value			1,903,997,000	1,904,732,000	1,903,997,000
Cash, Restricted Cash			$ 118,520,000	145,726,000	118,520,000
Replacement period			2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations			$ 315,000,000.0
Maximum period to acquire additional loan obligations			180 days
Notional amount of residual interest retained			$ 385,900,000		385,900,000
Value of portfolio loans and cash as collateral			1,790,000,000		1,790,000,000
Face value of loan obligations will be owned by the issuer			$ 2,100,000,000		$ 2,100,000,000
Leverage (as a percent)			82.00%		82.00%
Credit and repurchase facilities, Principal/Notional Amount			$ 194,300,000		$ 194,300,000
CLO 17 \| One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)			1.68%		1.68%
CLO 17 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained			$ 194,300,000		$ 194,300,000
CLO 16
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			1,370,000,000		$ 1,370,000,000
Debt, Face Value (UPB)			1,237,500,000	1,237,500,000	1,237,500,000
Securitized debt			$ 1,230,093,000	$ 1,231,887,000	$ 1,230,093,000
Weighted average rate (as a percent)			1.44%	5.79%	1.44%
Collateral Loans, Unpaid Principal			$ 1,444,573,000	$ 1,307,244,000	$ 1,444,573,000
Collateral Loans, Carrying Value			1,436,743,000	1,301,794,000	$ 1,436,743,000
Cash, Restricted Cash				106,495,000
Replacement period					2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations					$ 313,000,000.0
Maximum period to acquire additional loan obligations					180 days
Notional amount of residual interest retained			262,500,000		$ 262,500,000
Value of portfolio loans and cash as collateral			1,190,000,000		1,190,000,000
Face value of loan obligations will be owned by the issuer			$ 1,500,000,000		$ 1,500,000,000
Leverage (as a percent)			83.00%		83.00%
Credit and repurchase facilities, Principal/Notional Amount			$ 135,000,000.0		$ 135,000,000.0
CLO 16 \| One-month LIBOR
Debt Obligations
Weighted average rate (as a percent)			1.31%		1.31%
CLO 16 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained			$ 135,000,000.0		$ 135,000,000.0
CLO 15
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			747,800,000		$ 747,800,000
Debt, Face Value (UPB)			674,412,000	674,412,000	674,412,000
Securitized debt			$ 669,723,000	$ 671,532,000	$ 669,723,000
Weighted average rate (as a percent)			1.49%	5.84%	1.49%
Collateral Loans, Unpaid Principal			$ 785,761,000	$ 797,755,000	$ 785,761,000
Collateral Loans, Carrying Value			782,682,000	795,078,000	782,682,000
Cash, Restricted Cash			15,750,000	2,861,000	$ 15,750,000
Replacement period					2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations					$ 162,000,000.0
Maximum period to acquire additional loan obligations					180 days
Notional amount of residual interest retained			$ 140,600,000		$ 140,600,000
Weighted average note rate including certain fees and costs (as a percent)			1.37%		1.37%
Value of portfolio loans and cash as collateral			$ 653,000,000.0		$ 653,000,000.0
Face value of loan obligations will be owned by the issuer			$ 815,000,000.0		$ 815,000,000.0
Leverage (as a percent)			83.00%		83.00%
Credit and repurchase facilities, Principal/Notional Amount			$ 73,400,000		$ 73,400,000
CLO 15 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained			73,400,000		$ 73,400,000
CLO 14
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			724,200,000		$ 724,200,000
Debt, Face Value (UPB)			655,475,000	655,475,000	655,475,000
Securitized debt			$ 650,947,000	$ 652,617,000	$ 650,947,000
Weighted average rate (as a percent)			1.45%	5.80%	1.45%
Collateral Loans, Unpaid Principal			$ 717,396,000	$ 732,247,000	$ 717,396,000
Collateral Loans, Carrying Value			715,154,000	730,057,000	715,154,000
Cash, Restricted Cash			53,342,000	37,090,000	$ 53,342,000
Replacement period					2 years 6 months
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations					$ 149,800,000
Maximum period to acquire additional loan obligations					180 days
Notional amount of residual interest retained			129,500,000		$ 129,500,000
Value of portfolio loans and cash as collateral			635,200,000		635,200,000
Face value of loan obligations will be owned by the issuer			$ 785,000,000.0		$ 785,000,000.0
Leverage (as a percent)			84.00%		84.00%
Credit and repurchase facilities, Principal/Notional Amount			$ 68,700,000		$ 68,700,000
CLO 14 \| One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)			1.33%		1.33%
CLO 14 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained			$ 68,700,000		$ 68,700,000
CLO 13
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						$ 738,000,000.0
Debt, Face Value (UPB)			668,000,000	462,769,000	668,000,000	$ 668,000,000.0
Securitized debt			$ 665,006,000	$ 461,005,000	$ 665,006,000
Weighted average rate (as a percent)			1.54%	6.03%	1.54%
Collateral Loans, Unpaid Principal			$ 740,369,000	$ 552,182,000	$ 740,369,000
Collateral Loans, Carrying Value			738,265,000	550,924,000	738,265,000
Cash, Restricted Cash			48,543,000	37,875,000	48,543,000
Replacement period						3 years
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations						$ 159,500,000
Maximum period to acquire additional loan obligations						180 days
Notional amount of residual interest retained						$ 132,000,000.0
Value of portfolio loans and cash as collateral						640,500,000
Face value of loan obligations will be owned by the issuer						$ 800,000,000.0
Leverage (as a percent)						84.00%
Credit and repurchase facilities, Principal/Notional Amount						$ 70,000,000.0
Repayment of debt				205,200,000
CLO 13 \| One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)						1.41%
CLO 13 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained						$ 70,000,000.0
CLO 12
Debt Obligations
Number of tranches of CLO notes issued \| tranche							8
Number of newly-formed wholly-owned subsidiaries \| item							2
Proceeds from issuance of securitized debt							$ 124,100,000
Value of the tranches issued							585,800,000
Debt, Face Value (UPB)			534,193,000	379,283,000	534,193,000		534,200,000
Securitized debt			$ 531,939,000	$ 378,331,000	$ 531,939,000		$ 51,600,000
Weighted average rate (as a percent)			1.62%	6.09%	1.62%
Collateral Loans, Unpaid Principal			$ 557,249,000	$ 466,474,000	$ 557,249,000
Collateral Loans, Carrying Value			555,974,000	465,003,000	555,974,000
Cash, Restricted Cash			35,635,000	500,000	35,635,000
Replacement period							3 years
Maximum period to acquire additional loan obligations							180 days
Notional amount of residual interest retained							$ 100,800,000
Value of portfolio loans and cash as collateral							510,900,000
Face value of loan obligations will be owned by the issuer							$ 635,000,000.0
Leverage (as a percent)							84.00%
Repayment of debt				154,900,000
CLO 12 \| One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)							1.50%
CLO 12 \| Below investment grade
Debt Obligations
Notional amount of residual interest retained							$ 51,600,000
CLO 10
Debt Obligations
Value of the tranches issued		441,000,000.0
Debt, Face Value (UPB)			441,000,000		441,000,000
Securitized debt			$ 439,553,000		$ 439,553,000
Weighted average rate (as a percent)			1.57%		1.57%
Collateral Loans, Unpaid Principal			$ 485,460,000		$ 485,460,000
Collateral Loans, Carrying Value			483,995,000		483,995,000
Cash, Restricted Cash			57,706,000		57,706,000
Value of portfolio loans and cash as collateral		$ 1,400,000
CLO 11 and CLO 9
Debt Obligations
Debt Instrument Redemption Value			889,200,000		889,200,000
Deferred fees expensed as interest expense					3,400,000
CLO 8
Debt Obligations
Debt Instrument Redemption Value						282,900,000
Deferred fees expensed as interest expense						$ 1,500,000
CLO VII
Debt Obligations
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations				230,000,000.0	133,700,000
Q Series securitization
Debt Obligations
Debt, Face Value (UPB)				236,878,000
Securitized debt				$ 233,906,000
Weighted average rate (as a percent)				6.30%
Collateral Loans, Unpaid Principal				$ 315,837,000
Collateral Loans, Carrying Value				$ 313,965,000
Weighted average note rate including certain fees and costs (as a percent)				6.66%
Total securitized debt
Debt Obligations
Debt, Face Value (UPB)			5,924,705,000	$ 7,886,066,000	5,924,705,000
Securitized debt			$ 5,892,810,000	$ 7,849,270,000	$ 5,892,810,000
Weighted average rate (as a percent)			1.59%	6.11%	1.59%
Collateral Loans, Unpaid Principal			$ 6,645,088,000	$ 8,935,047,000	$ 6,645,088,000
Collateral Loans, Carrying Value			6,616,810,000	8,900,104,000	6,616,810,000
Cash, Restricted Cash			$ 329,496,000	$ 480,817,000	$ 329,496,000
Joint Repurchase Facility 1.00 Billion [Member] \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			2.04%	6.39%	2.04%
Credit and repurchase facilities, Principal/Notional Amount			$ 676,608,000	$ 499,891,000	$ 676,608,000
$225M credit facility \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			2.79%	6.90%	2.79%
Credit and repurchase facilities, Principal/Notional Amount			$ 28,213,000	$ 47,398,000	$ 28,213,000
$200M credit facility \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			1.60%	5.76%	1.60%
Credit and repurchase facilities, Principal/Notional Amount			$ 115,351,000	$ 31,519,000	$ 115,351,000
$50M credit facility \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			2.13%	6.48%	2.13%
Credit and repurchase facilities, Principal/Notional Amount			$ 29,200,000	$ 29,200,000	$ 29,200,000
$50M credit facility \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			1.40%	5.65%	1.40%
Credit and repurchase facilities, Principal/Notional Amount			$ 9,295,000	$ 14,671,000	$ 9,295,000
$25M credit facility \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			4.06%	6.99%	4.06%
Credit and repurchase facilities, Principal/Notional Amount			$ 1,235,000	$ 19,177,000	$ 1,235,000
$1M master security agreement \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			4.01%		4.01%
Credit and repurchase facilities, Principal/Notional Amount			$ 635,000		$ 635,000
Repurchase facility - securities \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			3.40%	6.99%	3.40%
Credit and repurchase facilities, Principal/Notional Amount			$ 30,849,000	$ 12,832,000	$ 30,849,000
$750M ASAP agreement \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			1.40%	5.21%	1.40%
Value of portfolio loans and cash as collateral				$ 750,000,000.0
Credit and repurchase facilities, Principal/Notional Amount			$ 182,130,000	$ 29,476,000	$ 182,130,000
$500M joint repurchase facility \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			2.11%	6.52%	2.11%
Credit and repurchase facilities, Principal/Notional Amount			$ 399,470,000	$ 105,275,000	$ 399,470,000
$150M credit facility \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			1.51%	5.76%	1.51%
Credit and repurchase facilities, Principal/Notional Amount			$ 16,657,000	$ 57,974,000	$ 16,657,000
$1.3M repurchase facility (2) \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			3.00%	6.66%	3.00%
Credit and repurchase facilities, Principal/Notional Amount			$ 1,253,000	$ 534,000	$ 1,253,000
$25M credit facility. \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			2.38%		2.38%
Credit and repurchase facilities, Principal/Notional Amount			$ 10,285,000		$ 10,285,000
Warehouse Repurchase Facility 500 Million [Member] \| Structured Transaction Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)				7.16%
Credit and repurchase facilities, Principal/Notional Amount				$ 155,121,000
Warehouse Repurchase Facility 500 Million [Member] \| Agency Business Segment [Member]
Debt Obligations
Weighted average rate (as a percent)			1.58%	5.73%	1.58%
Credit and repurchase facilities, Principal/Notional Amount			$ 236,527,000	$ 66,866,000	$ 236,527,000