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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Cash and Cash Equivalents and Restricted Cash [Abstract]          
Restricted cash $ 48,714   $ 48,714   $ 8,185
Variation margin 6,500   6,500   3,200
Realized loss on RMBS, net [Abstract]          
Gain on RMBS 438 $ 0 438 $ 104  
Loss on RMBS (163) (428) (163) (5,534)  
Net realized gain (loss) on RMBS 275 (428) 275 (5,430)  
Realized gain (loss) on derivatives, net 12,627 (707) 4,786 (2,727)  
Unrealized gain (loss) on derivatives, net (2,133) 8,807 (14,224) 34,442  
Unrealized gain (loss) on investments in Servicing Related Assets (37,514) 6,218 (108,731) 18,351  
Realized gain on acquired assets, net 54 0 54 0  
Total (26,691) $ 13,890 (117,840) $ 44,636  
Derivatives [Member]          
Cash and Cash Equivalents and Restricted Cash [Abstract]          
Restricted cash 7,100   7,100   687
Repurchase Agreements [Member]          
Cash and Cash Equivalents and Restricted Cash [Abstract]          
Restricted cash 41,600   41,600   7,500
Receivables and Other Assets [Member] | RMBS [Member]          
Investments in RMBS [Abstract]          
Income receivable $ 7,600   $ 7,600   $ 5,700