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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Transfer of Securitizations or Asset-backed Financing Financial Assets Accounted for as Sale [Abstract]        
Proceeds received from securitizations $ 338,199 $ 1,022,152 $ 715,698 $ 2,024,149
Servicing fees collected 10,077 9,843 20,425 19,950
Purchases of previously transferred assets, net of claims reimbursed (659) (1,737) (2,829) (2,724)
Cash flows received from and paid to securitization trusts $ 347,617 $ 1,030,258 $ 733,294 $ 2,041,375