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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Debt securities:        
Interest expense $ 47,281 $ 110,961 $ 212,471 $ 308,083
Financing Liabilities [Member]        
Debt securities:        
Interest expense 15,317 73,096 118,579 193,675
Match Funded Liabilties [Member]        
Debt securities:        
Interest expense 11,981 17,349 37,499 53,656
Other Secured Borrowings [Member]        
Debt securities:        
Interest expense 10,990 13,450 30,174 38,877
Senior Notes [Member]        
Debt securities:        
Interest expense 7,452 6,130 22,355 18,399
Other [Member]        
Debt securities:        
Interest expense $ 1,541 $ 936 $ 3,864 $ 3,476