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Debt Obligations, Credit Facilities and Repurchase Agreements (Details) - USD ($) $ in Thousands		1 Months Ended				3 Months Ended	6 Months Ended
	Jul. 31, 2020	May 31, 2020	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt Obligations
UPB							$ 1,240,910	$ 1,681,146
Debt Carrying Value							1,235,613	1,678,288
Collateral Carrying Value							$ 1,521,218	$ 1,747,371
Weighted Average Note Rate (as a percent)							2.49%	3.54%
LIBOR Floor rate		0.005%	0.0075%
Minimum
Debt Obligations
Variable rate, spread (as a percent)		0.023%
Maximum
Debt Obligations
Variable rate, spread (as a percent)		0.03%
Joint Repurchase Facility
Debt Obligations
Committed amount						$ 1,100,000
Matures in March 2021			$ 600,000			600,000
Matures in March 2022			500,000			$ 500,000
Extension of maturity date (in years)						1 year
Credit facility, sublimit			800,000			$ 800,000
Reduced sublimit unless that portion of the facility is extended through March 2022						500,000
$400 million repurchase facility
Debt Obligations
Additional borrowing capacity			400,000			400,000
$75 million credit facility - One
Debt Obligations
Decrease in borrowing capacity		$ 125,000
Additional borrowing capacity				$ 75,000
Committed amount				150,000	$ 75,000
Repurchase facility - securities \| CLOs
Debt Obligations
Collateral Carrying Value							$ 275,700	$ 234,900
Repurchase facility - securities \| B Piece bonds
Debt Obligations
Collateral Carrying Value							63,200	68,700
Repurchase facility - securities \| SFR bonds
Debt Obligations
Debt Instrument, Collateral Amount							20,000	20,000
$23.0 million credit facility
Debt Obligations
Maximum borrowing capacity							$ 23,000
Fixed interest rates							3.50%
Subsequent Event
Debt Obligations
Variable rate, spread (as a percent)	2.00%
LIBOR Floor rate	0.25%
Structured Business
Debt Obligations
Debt Carrying Value							$ 902,140	934,694
Collateral Carrying Value							$ 1,184,584	$ 1,002,993
Weighted Average Note Rate (as a percent)							2.91%	3.94%
Weighted average note rate including certain fees and costs (as a percent)							3.33%	4.39%
Unamortized deferred finance costs							$ 4,000	$ 2,100
Leverage on loans and investment portfolio financed through credit facilities and repurchase agreements, excluding securities repurchase facility, working capital line of credit and security agreements used to finance leasehold and capital expenditure improvements at corporate office (as a percent)							71.00%	71.00%
Structured Business \| $500 million joint repurchase facility
Debt Obligations
Debt Carrying Value							$ 321,553	$ 224,658
Collateral Carrying Value							$ 480,258	$ 339,378
Weighted Average Note Rate (as a percent)							2.74%	4.06%
Maximum borrowing capacity							$ 500,000	$ 500,000
Structured Business \| $500 million joint repurchase facility \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.75%
Structured Business \| $500 million joint repurchase facility \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							3.50%
Structured Business \| $400 million repurchase facility
Debt Obligations
Debt Carrying Value							$ 199,901	218,418
Collateral Carrying Value							$ 279,130	$ 291,292
Weighted Average Note Rate (as a percent)							2.99%	3.76%
Maximum borrowing capacity			$ 400,000			400,000	$ 400,000	$ 400,000
Decrease in interest rate (as a percent)			25.00%
Structured Business \| $400 million repurchase facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.20%
Structured Business \| $400 million repurchase facility \| Maximum
Debt Obligations
Variable rate, spread (as a percent)							0.75%
Structured Business \| $200 million repurchase facility
Debt Obligations
Debt Carrying Value							$ 48,448	40,530
Collateral Carrying Value							$ 57,169	$ 48,086
Weighted Average Note Rate (as a percent)							2.60%	4.22%
Maximum borrowing capacity							$ 200,000	$ 200,000
Structured Business \| $200 million repurchase facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.40%
Structured Business \| $144.3 million loan specific credit facilities
Debt Obligations
Debt Carrying Value							$ 144,048	128,274
Collateral Carrying Value							$ 193,209	$ 184,116
Weighted Average Note Rate (as a percent)							2.69%	4.13%
Maximum borrowing capacity							$ 144,300	$ 144,300
Structured Business \| $144.3 million loan specific credit facilities \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.10%
Structured Business \| $144.3 million loan specific credit facilities \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.50%
Structured Business \| $125 million credit facility
Debt Obligations
Debt Carrying Value							$ 25,613	4,570
Collateral Carrying Value							$ 31,790	$ 7,000
Weighted Average Note Rate (as a percent)							2.84%	3.56%
Maximum borrowing capacity							$ 125,000	$ 125,000
Structured Business \| $125 million credit facility \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.30%
Structured Business \| $125 million credit facility \| Maximum
Debt Obligations
Variable rate, spread (as a percent)							0.50%
Structured Business \| $100 million repurchase facility
Debt Obligations
Debt Carrying Value							$ 50,297	45,843
Collateral Carrying Value							$ 66,486	$ 63,800
Weighted Average Note Rate (as a percent)							1.94%	3.56%
Maximum borrowing capacity							$ 100,000	$ 100,000
Structured Business \| $100 million repurchase facility \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.75%
Structured Business \| $100 million repurchase facility \| Maximum
Debt Obligations
Variable rate, spread (as a percent)							1.95%
Structured Business \| $50 million credit facility - one
Debt Obligations
Debt Carrying Value							$ 8,800	14,933
Collateral Carrying Value							$ 11,000	$ 17,650
Weighted Average Note Rate (as a percent)							2.19%	3.81%
Maximum borrowing capacity							$ 50,000	$ 50,000
Structured Business \| $50 million credit facility - one \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.00%
Structured Business \| $50 million credit facility - two
Debt Obligations
Debt Carrying Value							$ 19,345	12,191
Collateral Carrying Value							$ 28,042	$ 16,499
Weighted Average Note Rate (as a percent)							4.06%	4.32%
Structured Business \| $50 million credit facility - two \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.50%
Structured Business \| $50 million credit facility - three
Debt Obligations
Debt Carrying Value							$ 5,274	$ 5,254
Collateral Carrying Value							$ 6,600	$ 6,600
Weighted Average Note Rate (as a percent)							2.70%	4.32%
Maximum borrowing capacity							$ 50,000
Structured Business \| $50 million credit facility - three \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.50%
Structured Business \| $50 million credit facility - three \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							3.25%
Structured Business \| $25 million credit facility
Debt Obligations
Debt Carrying Value							$ 19,644	$ 19,651
Collateral Carrying Value							$ 30,900	$ 28,572
Weighted Average Note Rate (as a percent)							2.45%	4.07%
Maximum borrowing capacity							$ 25,000	$ 25,000
Structured Business \| $25 million credit facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.25%
Structured Business \| $25 million working capital facility
Debt Obligations
Maximum borrowing capacity							$ 25,000	25,000
Structured Business \| $25 million working capital facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.25%
Structured Business \| $2.8 million master security agreements
Debt Obligations
Debt Carrying Value							$ 2,249	$ 3,267
Weighted Average Note Rate (as a percent)							4.12%	4.08%
Maximum borrowing capacity							$ 2,800	$ 2,800
Structured Business \| $2.8 million master security agreements \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.97%
Structured Business \| $2.8 million master security agreements \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							4.60%
Structured Business \| Repurchase facility - securities
Debt Obligations
Debt Carrying Value	$ 42,000						$ 56,968	$ 217,105
Weighted Average Note Rate (as a percent)							5.11%	3.90%
Reduction in principal amount							$ 160,100
Structured Business \| Repurchase facility - securities \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							2.25%
Structured Business \| Repurchase facility - securities \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							5.00%
Structured Business \| $300 million repurchase facility
Debt Obligations
Maximum borrowing capacity			$ 300,000			300,000
Agency Business
Debt Obligations
Debt Carrying Value							$ 333,473	$ 743,594
Collateral Carrying Value							$ 336,634	$ 744,378
Weighted Average Note Rate (as a percent)							1.37%	3.03%
Unamortized deferred finance costs							$ 1,200	$ 200
Agency Business \| $600 million joint repurchase facility
Debt Obligations
Debt Carrying Value							2,464	299,824
Collateral Carrying Value							$ 5,462	$ 300,446
Weighted Average Note Rate (as a percent)							2.91%	3.26%
Variable rate, spread (as a percent)							2.75%
Maximum borrowing capacity							$ 600,000	$ 600,000
Agency Business \| $600 million joint repurchase facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.50%
Agency Business \| $750 million ASAP agreement
Debt Obligations
Debt Carrying Value							$ 41,553	148,725
Collateral Carrying Value							$ 41,553	$ 148,725
Weighted Average Note Rate (as a percent)							1.40%	2.81%
Variable rate, spread (as a percent)							0.35%
Maximum borrowing capacity							$ 750,000	$ 750,000
Agency Business \| $750 million ASAP agreement \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.05%
Agency Business \| $300 million repurchase facility
Debt Obligations
Debt Carrying Value							$ 75,905	187,698
Collateral Carrying Value							$ 75,925	$ 187,742
Weighted Average Note Rate (as a percent)							1.31%	2.91%
Maximum borrowing capacity							$ 300,000	$ 300,000
Agency Business \| $300 million repurchase facility \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.15%
Agency Business \| $150 million credit facility - one
Debt Obligations
Debt Carrying Value							$ 85,770	89,657
Collateral Carrying Value							$ 85,913	$ 89,673
Weighted Average Note Rate (as a percent)							1.31%	2.91%
Maximum borrowing capacity							$ 150,000	$ 150,000
Agency Business \| $150 million credit facility - one \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.15%
Agency Business \| $150 million credit facility - two
Debt Obligations
Debt Carrying Value							$ 95,761	17,690
Collateral Carrying Value							$ 95,761	$ 17,792
Weighted Average Note Rate (as a percent)							1.31%	2.91%
Maximum borrowing capacity							$ 150,000	$ 150,000
Agency Business \| $150 million credit facility - two \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.15%
Agency Business \| $100 million credit facility
Debt Obligations
Debt Carrying Value							$ 32,020
Collateral Carrying Value							$ 32,020
Weighted Average Note Rate (as a percent)							1.65%
Variable rate, spread (as a percent)							0.50%
Maximum borrowing capacity							$ 100,000
Agency Business \| $100 million credit facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)							1.15%
Agency Business \| $500 million repurchase facility
Debt Obligations
Maximum borrowing capacity			$ 300,000	$ 500,000		$ 300,000
Agency Business \| Subsequent Event \| $50 million credit facility - one
Debt Obligations
Principal and interest advances	50,000
Agency Business \| Subsequent Event \| $150 million credit facility - one
Debt Obligations
Maximum borrowing capacity	$ 150,000