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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