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Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Results of Operations (Unaudited) (Footnote) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]        
Bargain purchase gain   $ 64,036 $ 0 $ 0
Increase in fair value of non-agency MSRs   84,400    
Increase in valuation of financing liabilities   $ 73,400    
Recovery of losses related to a settlement of outstanding claims $ 28,500