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Debt Obligations - Credit and Repurchase Facilities (Details) - USD ($) $ in Thousands		1 Months Ended							9 Months Ended
	Apr. 01, 2022	Sep. 30, 2022	Jul. 31, 2022	Jun. 30, 2022	Apr. 30, 2022	Mar. 31, 2022	Jan. 31, 2022	Oct. 31, 2021	Sep. 30, 2022	Dec. 31, 2021
Debt Obligations
Collateral Carrying Value		$ 5,947,501							$ 5,947,501	$ 5,585,460
Maximum borrowing capacity						$ 200,000
Carrying amount of equity component		$ 100,000							$ 100,000
Utilization of credit facility						$ 50,000		$ 67,000
Extension of maturity date (in years)						1 year	1 year
Weighted Average Note Rate (as a percent)		5.27%							5.27%
Debt Carrying Value		$ 4,633,132							$ 4,633,132	4,481,579
$325M repurchase facility
Debt Obligations
Total committed amount	$ 450,000					$ 325,000
$30M working capital facility
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)					3.00%
Total committed amount					$ 35,000	$ 30,000
Repurchase facility - securities (4) \| B Piece bonds
Debt Obligations
Collateral Carrying Value		34,500							34,500	47,600
$35M working capital facility
Debt Obligations
Maximum borrowing capacity		35,000							35,000	35,000
$200 million repurchase facility. \| SOFR
Debt Obligations
Decrease in interest rate (as a percent)						2.55%
Joint Repurchase Facility
Debt Obligations
Additional borrowing capacity		150,000							$ 150,000
Advance rate (as a percent)									80.00%
Joint Repurchase Facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)									7.00%
Joint Repurchase Facility \| Minimum
Debt Obligations
Maximum borrowing capacity		2,500,000							$ 2,500,000
Joint Repurchase Facility \| Maximum
Debt Obligations
Maximum borrowing capacity		3,000,000							3,000,000
Structured Transaction Business
Debt Obligations
Collateral Carrying Value		5,408,679							5,408,679	4,548,653
Unamortized deferred finance costs		$ 9,200							$ 9,200	$ 7,700
Weighted average note rate including certain fees and costs (as a percent)		5.66%							5.66%	2.51%
Leverage on loans and investment portfolio financed through credit facilities and repurchase agreements, excluding securities repurchase facility, working capital line of credit and security agreement used to finance leasehold and capital expenditure improvements at corporate office (as a percent)		77.00%							77.00%	77.00%
Weighted Average Note Rate (as a percent)		5.36%							5.36%
Debt Carrying Value		$ 4,121,619							$ 4,121,619	$ 3,525,307
Maximum advance rate							80
Maximum advance rate, threshold percentage of Principal balance (as a percent)						75
Maximum advance rate, threshold percentage of Project cost (as a percent)						60
Maximum advance rate, threshold percentage of Underlying Property Value (as a percent)						60
Structured Transaction Business \| Minimum \| SOFR
Debt Obligations
Variable rate, spread (as a percent)							1.75%
Structured Transaction Business \| Maximum \| SOFR
Debt Obligations
Variable rate, spread (as a percent)							3.50%
Structured Transaction Business \| $2.5B joint repurchase facility (2)
Debt Obligations
Collateral Carrying Value		2,353,627							2,353,627	1,877,930
Maximum borrowing capacity		$ 2,500,000							$ 2,500,000	2,500,000
Weighted Average Note Rate (as a percent)		5.60%							5.60%
Debt Carrying Value		$ 1,826,527							$ 1,826,527	1,486,380
Structured Transaction Business \| $1B repurchase facility
Debt Obligations
Collateral Carrying Value		982,702							982,702	937,880
Maximum borrowing capacity		$ 1,000,000							$ 1,000,000	1,000,000
Weighted Average Note Rate (as a percent)		5.13%							5.13%
Debt Carrying Value		$ 708,834							$ 708,834	675,415
Structured Transaction Business \| $500M repurchase facility
Debt Obligations
Collateral Carrying Value		131,723							131,723
Maximum borrowing capacity		$ 500,000							$ 500,000	500,000
Expiration period after the lender provides written notice									6 months
Additional period to repurchase the underlying loans									6 months
Weighted Average Note Rate (as a percent)		5.82%							5.82%
Debt Carrying Value		$ 108,373							$ 108,373
Structured Transaction Business \| $450M repurchase facility.
Debt Obligations
Collateral Carrying Value		455,727							455,727	511,269
Maximum borrowing capacity		$ 450,000							$ 450,000	450,000
Weighted Average Note Rate (as a percent)		5.08%							5.08%
Debt Carrying Value		$ 349,278							$ 349,278	397,272
Structured Transaction Business \| $450M repurchase facility
Debt Obligations
Collateral Carrying Value		323,188							323,188	385,337
Maximum borrowing capacity		$ 450,000							$ 450,000	450,000
Weighted Average Note Rate (as a percent)		4.92%							4.92%
Debt Carrying Value		$ 250,358							$ 250,358	293,700
Structured Transaction Business \| $400 million credit facility
Debt Obligations
Collateral Carrying Value		82,500							82,500	236,538
Maximum borrowing capacity		$ 400,000							$ 400,000	400,000
Weighted Average Note Rate (as a percent)		4.66%							4.66%
Debt Carrying Value		$ 64,391							$ 64,391	177,406
Structured Transaction Business \| 399 M repurchase facility (2)
Debt Obligations
Collateral Carrying Value		465,188							465,188	289,956
Maximum borrowing capacity		$ 399,000							$ 399,000	399,000
Weighted Average Note Rate (as a percent)		5.30%							5.30%
Debt Carrying Value		$ 345,154							$ 345,154	241,450
Structured Transaction Business \| $225M credit facility
Debt Obligations
Collateral Carrying Value		108,881							108,881	42,270
Maximum borrowing capacity		$ 225,000							$ 225,000	225,000
Weighted Average Note Rate (as a percent)		5.58%							5.58%
Debt Carrying Value		$ 68,352							$ 68,352	27,826
Structured Transaction Business \| $50M credit facility
Debt Obligations
Collateral Carrying Value		36,500							36,500	36,500
Maximum borrowing capacity		$ 50,000							$ 50,000	50,000
Weighted Average Note Rate (as a percent)		5.21%							5.21%
Debt Carrying Value		$ 29,190							$ 29,190	29,194
Structured Transaction Business \| $25M credit facility
Debt Obligations
Collateral Carrying Value		7,745							7,745	1,900
Maximum borrowing capacity		$ 25,000							$ 25,000	25,000
Weighted Average Note Rate (as a percent)		5.72%							5.72%
Debt Carrying Value		$ 6,159							$ 6,159	1,235
Structured Transaction Business \| $25M credit facility.
Debt Obligations
Collateral Carrying Value										14,773
Debt Carrying Value										10,218
Structured Transaction Business \| $1M master security agreement
Debt Obligations
Weighted Average Note Rate (as a percent)		4.01%							4.01%
Debt Carrying Value		$ 161							$ 161	635
Structured Transaction Business \| Repurchase facility - securities (4)
Debt Obligations
Weighted Average Note Rate (as a percent)		5.74%							5.74%
Debt Carrying Value		$ 24,365							$ 24,365	30,849
Structured Transaction Business \| $140M loan specific credit facilities
Debt Obligations
Collateral Carrying Value		198,700							198,700	214,300
Maximum borrowing capacity		$ 140,000							$ 140,000	140,000
Weighted Average Note Rate (as a percent)		3.57%							3.57%
Debt Carrying Value		$ 139,641							$ 139,641	153,727
Structured Transaction Business \| $35M working capital facility
Debt Obligations
Maximum borrowing capacity		35,000							35,000	35,000
Structured Transaction Business \| $200 million repurchase facility.
Debt Obligations
Collateral Carrying Value		33,157							33,157
Maximum borrowing capacity		$ 200,000							$ 200,000	200,000
Weighted Average Note Rate (as a percent)		5.61%							5.61%
Debt Carrying Value		$ 21,365							$ 21,365
Structured Transaction Business \| $150 million repurchase facility
Debt Obligations
Maximum borrowing capacity							$ 150,000
Structured Transaction Business \| $200 million repurchase facility
Debt Obligations
Collateral Carrying Value		$ 229,041							$ 229,041
Weighted Average Note Rate (as a percent)		5.05%							5.05%
Debt Carrying Value		$ 179,471							$ 179,471
Structured Transaction Business \| $200.0 million credit facility
Debt Obligations
Total committed amount			$ 200,000
Variable rate, spread (as a percent)			1.86%
Additional borrowing capacity			$ 400,000
Structured Transaction Business \| $24.4 million credit facility
Debt Obligations
Total committed amount		$ 24,400
Variable rate, spread (as a percent)		1.91%
Structured Transaction Business \| $42.7 million credit facility
Debt Obligations
Total committed amount		$ 42,700
Variable rate, spread (as a percent)		2.20%
Structured Transaction Business \| $50.0 million credit facility
Debt Obligations
Total committed amount			$ 50,000
Variable rate, spread (as a percent)			2.10%
Structured Transaction Business \| $500.0 million credit facility
Debt Obligations
Total committed amount				$ 500,000
Variable rate, spread (as a percent)				2.76%
Maximum advance rate				82.5
Agency Business
Debt Obligations
Collateral Carrying Value		$ 538,822							538,822	1,036,807
Unamortized deferred finance costs		$ 600							$ 600	4,400
Weighted Average Note Rate (as a percent)		4.52%							4.52%
Debt Carrying Value		$ 511,513							$ 511,513	956,272
Agency Business \| $500M repurchase facility
Debt Obligations
Collateral Carrying Value		132,219							132,219	236,527
Maximum borrowing capacity		$ 500,000							$ 500,000	500,000
Weighted Average Note Rate (as a percent)		4.52%							4.52%
Debt Carrying Value		$ 132,201							$ 132,201	236,429
Agency Business \| $200M credit facility
Debt Obligations
Collateral Carrying Value		111,431							111,431	115,351
Maximum borrowing capacity		$ 200,000							$ 200,000	200,000
Weighted Average Note Rate (as a percent)		4.44%							4.44%
Debt Carrying Value		$ 111,335							$ 111,335	115,304
Agency Business \| $50M credit facility
Debt Obligations
Collateral Carrying Value		22,621							22,621	9,295
Maximum borrowing capacity		$ 50,000							$ 50,000	50,000
Weighted Average Note Rate (as a percent)		4.44%							4.44%
Debt Carrying Value		$ 22,621							$ 22,621	9,295
Agency Business \| $750M ASAP agreement
Debt Obligations
Collateral Carrying Value		46,505							46,505	182,140
Maximum borrowing capacity		$ 750,000							$ 750,000	750,000
Weighted Average Note Rate (as a percent)		3.61%							3.61%
Debt Carrying Value		$ 46,210							$ 46,210	182,130
Agency Business \| $500M joint repurchase facility
Debt Obligations
Collateral Carrying Value		121,452							121,452	475,360
Maximum borrowing capacity		$ 500,000							$ 500,000	500,000
Weighted Average Note Rate (as a percent)		5.14%							5.14%
Debt Carrying Value		$ 94,975							$ 94,975	395,317
Agency Business \| $150M credit facility
Debt Obligations
Collateral Carrying Value		103,662							103,662	16,657
Maximum borrowing capacity		$ 150,000							$ 150,000	150,000
Weighted Average Note Rate (as a percent)		4.44%							4.44%
Debt Carrying Value		$ 103,549							$ 103,549	16,544
Agency Business \| $1M repurchase facility (2)
Debt Obligations
Collateral Carrying Value		932							932	1,477
Maximum borrowing capacity		$ 1,000							$ 1,000
Weighted Average Note Rate (as a percent)		5.32%							5.32%
Debt Carrying Value		$ 622							$ 622	$ 1,253