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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
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Assets:    
Unpaid Principal/ Notional $ 15,510,501 $ 22,419,481
Loans held for investment, fair value 13,306,818 14,292,815
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment, Fair value 7,864,196 8,179,608
Non-Agency RMBS | Senior    
Assets:    
Year to Date Gain/(Loss) on Change in Fair Value 0 227
Non-Agency RMBS | Subordinated    
Assets:    
Unpaid Principal/ Notional 610,205 580,761
Fair Value 359,343 422,826
Year to Date Gain/(Loss) on Change in Fair Value (80,803) 1,319
Non-Agency RMBS | Senior, interest-only    
Assets:    
Unpaid Principal/ Notional 6,931,077 7,458,653
Fair Value 225,998 288,899
Year to Date Gain/(Loss) on Change in Fair Value (48,823) 24,136
Agency RMBS | Interest-only    
Assets:    
Unpaid Principal/ Notional 1,484,016 1,539,941
Fair Value 105,644 127,667
Year to Date Gain/(Loss) on Change in Fair Value (17,665) 2,327
Agency RMBS | Pass-through    
Assets:    
Unpaid Principal/ Notional 0 6,080,549
Fair Value 0 1,889,923
Year to Date Gain/(Loss) on Change in Fair Value (151,056) 52,011
Agency CMBS | Interest-only    
Assets:    
Unpaid Principal/ Notional 1,764,487 1,817,246
Fair Value 46,189 49,025
Year to Date Gain/(Loss) on Change in Fair Value 1,143 1,914
Agency CMBS | Project loans    
Assets:    
Unpaid Principal/ Notional 1,779,044 1,753,755
Fair Value 1,991,823  
Year to Date Gain/(Loss) on Change in Fair Value 75,662 41,162
Agency CMBS | Project loans    
Assets:    
Fair Value   6,362,628
Loans held for investment    
Assets:    
Year to Date Gain/(Loss) on Change in Fair Value (681,515)  
Loans held for investment, Unpaid Principal/Notional 13,594,580 13,924,291
Loans held for investment, fair value 13,306,818 14,292,815
Securitized debt    
Assets:    
Year to Date Gain/(Loss) on Change in Fair Value 642,171 (28,829)
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment, Unpaid Principal/Notional 8,521,651 8,184,369
Securitized debt at fair value, collateralized by loans held for investment, Fair value $ 7,864,196 $ 8,179,608