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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Transfers and Servicing [Abstract]        
Proceeds received from securitizations $ 1,415,952 $ 1,443,272 $ 2,486,724 $ 2,977,523
Servicing fees collected 8,229 9,140 19,093 14,334
Purchases of previously transferred assets, net of claims reimbursed 396 0 896 0
Cash flows received from and paid to securitization trusts $ 1,424,577 $ 1,452,412 $ 2,506,713 $ 2,991,857