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Borrowings - Schedule of Aggregate Long-term Borrowings (Footnote) (Details) - Financing Liabilities [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,195,074 $ 4,012,812
Sale of MSRs and Rights To MSRs [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross 499,000  
HMBS - Related Borrowings [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 4,601,556 $ 3,433,781
[1] OASIS noteholders are entitled to receive a monthly payment equal to the sum of: (a) 21 basis points of the UPB of the reference pool of Freddie Mac mortgages; (b) any termination payment amounts; (c) any excess refinance amounts; and (d) the note redemption amounts, each as defined in the indenture supplement for the notes. Monthly amortization of the liability is estimated using the proportion of monthly projected service fees on the underlying MSRs as a percentage of lifetime projected fees, adjusted for the term of the notes.