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Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Asset Retirement Obligation [Line Items]      
Property and equipment useful life 5 years    
Asset retirement obligation      
Balance at beginning of period $ 69,757    
Additional obligations 6,054    
Accretion expense 1,407    
Change in estimates 462    
Payments (12,358)    
Foreign currency translation adjustments (2,663)    
Balance at end of period, net 62,659    
Less: current portion of asset retirement obligations 6,954   $ 9,837
Balance at end of period, excluding current portion 55,705   $ 59,920
Level 3      
Asset retirement obligation      
Additional obligations $ 6,000 $ 16,800