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Fair Value Measurements - Unpaid Principal, Fair Value and Impact of Changes in Fair Value on Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Assets:          
Unpaid Principal/ Notional $ 10,660,492   $ 10,660,492   $ 12,211,298
Loans held for investment, fair value 12,533,864   12,533,864   13,112,129
Liabilities:          
Securitized debt at fair value, collateralized by loans held for investment, Fair value 7,947,644   7,947,644   8,711,677
Non-Agency RMBS | Senior          
Liabilities:          
Change in fair value of financial instruments 0 $ 0 0 $ 0  
Non-Agency RMBS | Subordinated          
Assets:          
Unpaid Principal/ Notional 654,814   654,814   632,335
Fair Value 494,170   494,170   416,745
Liabilities:          
Change in fair value of financial instruments 23,228 31,328 56,638 (56,632)  
Non-Agency RMBS | Senior, interest-only          
Assets:          
Unpaid Principal/ Notional 4,225,195   4,225,195   5,628,240
Fair Value 187,218   187,218   262,259
Liabilities:          
Change in fair value of financial instruments 630 (12,626) (26,941) 44,320  
Agency RMBS | Pass-through          
Liabilities:          
Change in fair value of financial instruments 0 0 0 (151,056)  
Agency RMBS | Interest-only          
Assets:          
Unpaid Principal/ Notional 1,067,557   1,067,557   1,262,963
Fair Value 65,889   65,889   90,738
Liabilities:          
Change in fair value of financial instruments (7,134) (824) (12,460) (12,302)  
Agency CMBS | Interest-only          
Assets:          
Unpaid Principal/ Notional 2,351,641   2,351,641   1,326,665
Fair Value 135,825   135,825   25,885
Liabilities:          
Change in fair value of financial instruments (463) 2,788 1,777 4,415  
Agency CMBS | Project loans          
Assets:          
Unpaid Principal/ Notional 746,123   746,123   1,413,719
Fair Value 841,519   841,519   1,592,473
Liabilities:          
Change in fair value of financial instruments (17,129) (42,942) (72,013) 45,069  
Loans held for investment          
Assets:          
Loans held for investment, Unpaid Principal/Notional 11,664,695   11,664,695   12,640,195
Loans held for investment, fair value 12,533,864   12,533,864   13,112,129
Liabilities:          
Change in fair value of financial instruments 248,244 371,423 348,971 (124,250)  
Securitized debt          
Liabilities:          
Securitized debt at fair value, collateralized by loans held for investment, Unpaid Principal/Notional 7,894,993   7,894,993   8,705,200
Securitized debt at fair value, collateralized by loans held for investment, Fair value 7,947,644   7,947,644   $ 8,711,677
Change in fair value of financial instruments $ (7,852) $ (88,381) $ 249,671 $ 78,394