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Commitments and Contingencies Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2016 complaint | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual, provision |  |  | $ 26,000 |  |
Restricted cash | $ 757 |  | 757 | $ 90,852 | $ 49,360
Unfavorable Regulatory Action [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual, provision |  |  | 26,000 |  |
Limited Disruption in Service [Member] | Migration of Third-Party Card Processor [Member] | Pending Litigation [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, new claims filed, number | complaint |  | 2 |  |  |
Limited Disruption in Service [Member] | Migration of Third-Party Card Processor [Member] | Other Current Liabilities [Member] | Pending Litigation [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual | 2,300 |  | $ 2,300 |  |
Loss contingency accrual, payments | $ 2,200 |  |  |  |

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