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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