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Fair Value of Financial Instruments (Level 3 Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Residential whole loans held at fair value for which the closing price of the purchase transaction had not occurred   $ 87,000   $ 87,000 $ 70,600
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 $ 1,200,981 1,438,827 $ 1,381,583 1,471,263  
Purchases and capitalized advances 0 85,855 0 210,030  
Changes in fair value recorded in Net gain on residential whole loans measured at fair value through earnings 58,863 13,185 (13,683) 33,312  
Cash collections, net of liquidation gains/(losses) (21,721) (31,212) (65,934) (94,821)  
Sales and repurchases (929) 0 (19,460) (1,216)  
Transfer to REO (7,530) (53,486) (52,842) (165,399)  
Balance at end of period $ 1,229,664 1,453,169 $ 1,229,664 1,453,169  
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   538,499  
Purchases and capitalized advances   0   573,137  
Cash collections, net of liquidation gains/(losses)   (3,920)   (12,897)  
Changes in unrealized gains   2,024   5,391  
Transfer to Level 2   (1,104,130)   (1,104,130)  
Balance at end of period   $ 0   $ 0