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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents and Restricted Cash [Abstract]                      
Restricted cash $ 67,037       $ 8,185       $ 67,037 $ 8,185  
Variation margin 1,100       3,200       1,100 3,200  
Realized gain (loss) on RMBS, net [Abstract]                      
Gain on RMBS                 1,285 104 $ 213
Loss on RMBS                 (383) (8,466) (716)
Net realized gain (loss) on RMBS 627 $ 275 $ 0 $ 0 (2,932) $ (428) $ (121) $ (4,881) 902 (8,362) (503)
Realized loss on derivatives, net (17,148) 12,627 (365) (7,476) (3,162) (707) (2,033) 13 (12,362) (5,889) (5,554)
Unrealized gain (loss) on derivatives, net 3,357 (2,133) (3,819) (8,272) (30,937) 8,807 6,009 19,626 (10,867) 3,505 6,580
Realized gain on Excess MSRs, net                 0 0 6,678
Unrealized gain (loss) on investments in Servicing Related Assets 1,959 (37,514) (44,042) (27,175) (21,924) $ 6,218 $ (365) $ 12,498 (106,772) (3,573) 9,159
Realized gain on acquired assets, net (28) $ 54 $ 0 $ 0         26 0 0
Total                 (129,073) (14,319) $ 16,360
Derivatives [Member]                      
Cash and Cash Equivalents and Restricted Cash [Abstract]                      
Restricted cash 5,700       687       5,700 687  
Repurchase Agreements [Member]                      
Cash and Cash Equivalents and Restricted Cash [Abstract]                      
Restricted cash 61,300       7,500       61,300 7,500  
Receivables and Other Assets [Member] | RMBS [Member]                      
Investments in RMBS [Abstract]                      
Income receivable $ 7,700       $ 5,700       $ 7,700 $ 5,700