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Accounts Receivable - Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable current and noncurrent, net | $ 27,405 |  | $ 35,277 |  |  |
Overdrawn account balances due from cardholders |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable, gross | 21,033 |  | 17,856 |  |  |
Reserve for uncollectible overdrawn accounts | (16,280) | $ (17,087) | (14,471) | $ (15,387) | $ (13,619) | $ (11,932)
Accounts receivable current and noncurrent, net | 4,753 |  | 3,385 |  |  |
Trade receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable, gross | 8,359 |  | 4,231 |  |  |
Reserve for uncollectible overdrawn accounts | (1,101) |  | (3) |  |  |
Accounts receivable current and noncurrent, net | 7,258 |  | 4,228 |  |  |
Receivables due from card issuing banks |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable, gross | 6,779 |  | 6,309 |  |  |
Fee advances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable, gross | 3,010 |  | 16,194 |  |  |
Other receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable, gross | $ 5,605 |  | $ 5,161 |  |  |

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