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Repurchase Agreements (Undrawn Financing Commitment) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Repurchase agreements $ 8,571,422 $ 7,879,087
MSR Asset Financing    
Debt Instrument [Line Items]    
Repurchase agreement, borrowing commitment 75,000  
Repurchase agreements $ 45,100  
MSR Asset Financing | Minimum    
Debt Instrument [Line Items]    
Commitment fee 0.125%  
MSR Asset Financing | Maximum    
Debt Instrument [Line Items]    
Commitment fee 0.50%