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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
Mar. 31, 2019
Mar. 31, 2018
Transfers and Servicing [Abstract]    
Proceeds received from securitizations $ 242,960 $ 377,499
Servicing fees collected 15,918 10,348
Purchases of previously transferred assets, net of claims reimbursed (904) (2,170)
Cash flows received from and paid to securitization trusts $ 257,974 $ 385,677