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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Transfers and Servicing [Abstract]        
Proceeds received from securitizations $ 1,478,142 $ 1,369,468 $ 3,964,866 $ 4,346,991
Servicing fees collected 5,973 10,840 25,066 25,174
Purchases of previously transferred assets, net of claims reimbursed 1,512 2,237 2,408 2,237
Cash flows received from and paid to securitization trusts $ 1,485,627 $ 1,382,545 $ 3,992,340 $ 4,374,402