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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt securities:      
Interest expense $ 275,041 $ 363,238 $ 412,583
Financing Liabilities [Member]      
Debt securities:      
Interest expense 176,683 242,514 248,834
Financing Liabilities [Member] | NRZ [Member]      
Debt securities:      
Interest expense 171,670 236,311 234,401
Financing Liabilities [Member] | Other Financing Liabilities With Unrelated Parties [Member]      
Debt securities:      
Interest expense 5,013 6,203 14,433
Match Funded Liabilties [Member]      
Debt securities:      
Interest expense 31,870 47,624 66,879
Senior Notes [Member]      
Debt securities:      
Interest expense 31,280 29,806 30,012
Other Secured Borrowings [Member]      
Debt securities:      
Interest expense 30,465 39,531 60,469
Other [Member]      
Debt securities:      
Interest expense $ 4,743 $ 3,763 $ 6,389