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Securitizations and Variable Interest Entities - Schedule of Cash Flows Related to Transfers Accounted for as Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Disclosure of Transfer of Securitizations or Asset-backed Financing Financial Assets Accounted for as Sale [Abstract]        
Proceeds received from securitizations $ 687,502 $ 1,511,991 $ 2,711,651 $ 3,878,461
Servicing fees collected 10,300 3,768 30,250 10,441
Purchases of previously transferred assets, net of claims reimbursed (1,234) (271) (3,958) (1,051)
Cash flows received from and paid to securitization trusts $ 696,568 $ 1,515,488 $ 2,737,943 $ 3,887,851