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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Debt securities:        
Interest expense $ 81,128 $ 91,033 $ 165,190 $ 197,122
Financing Liabilities [Member]        
Debt securities:        
Interest expense 50,293 52,803 103,262 120,578
Match Funded Liabilties [Member]        
Debt securities:        
Interest expense 12,669 18,133 25,518 36,307
Other Secured Borrowings [Member]        
Debt securities:        
Interest expense 9,636 12,715 19,184 25,428
Senior Notes [Member]        
Debt securities:        
Interest expense 7,447 6,129 14,903 12,270
Other [Member]        
Debt securities:        
Interest expense $ 1,083 $ 1,253 $ 2,323 $ 2,539