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Fair Value of Financial Instruments (Level 3 Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Loans committed to purchase in previous period, closing in subsequent period $ 87,000 $ 34,400 $ 87,000 $ 34,400  
Residential whole loans held at fair value for which the closing price of the purchase transaction had not occurred 70,600   70,600   $ 1,800
Recurring basis | Level 3 | Residential Whole Loans, at Fair Value          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance at beginning of period 1,438,827 1,468,540 1,471,263 1,325,115  
Purchases and capitalized advances 92,208 76,566 227,595 393,867  
Changes in fair value recorded in Net gain on residential whole loans measured at fair value through earnings 13,185 8,442 33,312 26,788  
Collection of principal, net of liquidation gains/(losses) (37,565) (54,331) (112,386) (155,199)  
Repurchases 0 (561) (1,216) (1,623)  
Transfer to REO (53,486) (51,089) (165,399) (141,381)  
Balance at end of period 1,453,169 1,447,567 1,453,169 1,447,567  
Recurring basis | Level 3 | Term Notes Backed by MSR Related Collateral          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Balance at beginning of period 1,106,026 381,390 538,499 381,804  
Purchases and capitalized advances 0 290,042 573,137 439,392  
Collection of principal, net of liquidation gains/(losses) (3,920) (166,120) (12,897) (316,120)  
Changes in unrealized gain/(losses) 2,024 (117) 5,391 119  
Transfer to Level 2 (1,104,130) 0 (1,104,130) 0  
Balance at end of period $ 0 $ 505,195 $ 0 $ 505,195