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Commitments and Contingencies (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 complaint | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual, provision |  | $ 26,000 |  |  |
Restricted cash |  |  | $ 559 | $ 90,852 | $ 62,374
Limited disruption in service | Migration of third-party card processor | Pending litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, new claims filed (in complaints) | complaint | 2 |  |  |  |
Limited disruption in service | Migration of third-party card processor | Other current liabilities | Pending litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual, payments |  |  | 13,500 |  |
Loss contingency accrual |  |  | $ 2,300 |  |

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