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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Reserve for uncollectible overdrawn accounts $ (17,087) $ (15,796)   $ (13,619) $ (12,233)  
Accounts receivable current and noncurrent, net 24,840   $ 35,277      
Receivables due from card issuing banks [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross 7,267   6,309      
Overdrawn Account Balances due from Cardholders [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross 21,391   17,856      
Reserve for uncollectible overdrawn accounts (17,087)   (14,471)     $ (11,932)
Accounts receivable current and noncurrent, net 4,304   3,385      
Trade Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross 3,878   4,231      
Reserve for uncollectible overdrawn accounts (67)   (3)      
Accounts receivable current and noncurrent, net 3,811   4,228      
Fee advances [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross 232   16,194      
Other receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross $ 9,226   $ 5,161