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Accounts Receivable - Reserve For Uncollectible Overdrawn Accounts (Details) - Overdrawn account balances due from cardholders - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Uncollectible Overdrawn Accounts [Roll Forward]    
Balance, beginning of period $ 13,888 $ 14,471
Provision for uncollectible overdrawn accounts:    
Fees 21,077 15,779
Purchase transactions 2,496 2,606
Charge-offs (20,336) (17,060)
Balance, end of period $ 17,125 $ 15,796