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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 |  |  |

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