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Fair Value Measurements - Schedule of Unpaid Principal, Fair Value and Impact of Changes in Fair Value on Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Unpaid Principal/ Notional $ 22,419,481 $ 23,577,333
Loans held for investment, fair value 14,292,815 12,572,581
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment, Fair value 8,179,608 8,455,376
Non-Agency RMBS | Subordinated    
Assets:    
Unpaid Principal/ Notional 580,761  
Fair Value 422,826 12,014
Year to Date Gain/(Loss) on Change in Fair Value 10,513 (145)
Non-Agency RMBS | Senior, interest-only    
Assets:    
Unpaid Principal/ Notional 7,458,653 5,888,747
Fair Value 288,899 266,539
Year to Date Gain/(Loss) on Change in Fair Value 18,064 21,356
Agency RMBS | Interest-only    
Assets:    
Unpaid Principal/ Notional 1,539,941 578,284
Fair Value 127,667 65,675
Year to Date Gain/(Loss) on Change in Fair Value (13,359) 3,785
Agency RMBS | Pass-through    
Assets:    
Unpaid Principal/ Notional 6,080,549 7,573,835
Fair Value 6,362,628 7,739,382
Year to Date Gain/(Loss) on Change in Fair Value 124,685 31,185
Agency CMBS | Interest-only    
Assets:    
Unpaid Principal/ Notional 1,817,246 2,450,288
Fair Value 49,025 67,670
Year to Date Gain/(Loss) on Change in Fair Value 2,054 444
Agency CMBS | Project loans    
Assets:    
Unpaid Principal/ Notional 1,753,755  
Fair Value 1,889,923  
Year to Date Gain/(Loss) on Change in Fair Value 146,441  
Agency CMBS | Project loans    
Assets:    
Unpaid Principal/ Notional   1,607,626
Fair Value   1,595,681
Year to Date Gain/(Loss) on Change in Fair Value   (35,002)
Loans held for investment    
Assets:    
Year to Date Gain/(Loss) on Change in Fair Value 240,148 (27,201)
Loans held for investment, Unpaid Principal/Notional 13,924,291 12,432,582
Loans held for investment, fair value 14,292,815 12,572,581
Securitized debt    
Assets:    
Year to Date Gain/(Loss) on Change in Fair Value (118,911) 52,209
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment, Unpaid Principal/Notional 8,184,369 8,561,319
Securitized debt at fair value, collateralized by loans held for investment, Fair value $ 8,179,608 $ 8,455,376