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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Disclosure of Transfer of Securitizations or Asset-backed Financing Financial Assets Accounted for as Sale [Abstract]        
Proceeds received from securitizations $ 1,022,152 $ 1,357,206 $ 2,024,149 $ 2,366,470
Servicing fees collected 9,843 3,549 19,950 6,673
Purchases of previously transferred assets, net of claims reimbursed (1,737) (766) (2,724) (779)
Cash flows received from and paid to securitization trusts $ 1,030,258 $ 1,359,989 $ 2,041,375 $ 2,372,364