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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt securities:      
Interest expense $ 363,238 $ 412,583 $ 482,373
Financing Liabilities [Member]      
Debt securities:      
Interest expense 242,514 248,834 292,306
Match Funded Liabilties [Member]      
Debt securities:      
Interest expense 47,624 66,879 65,248
Other Secured Borrowings [Member]      
Debt securities:      
Interest expense 39,531 60,469 91,391
Senior Notes [Member]      
Debt securities:      
Interest expense 29,806 30,012 26,259
Other [Member]      
Debt securities:      
Interest expense $ 3,763 $ 6,389 $ 7,169