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Property and Equipment, net - Depreciation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]    
Depreciation and amortization expense $ 8,139 $ 6,557
Impairment charges 1,227 0
Depreciation and Amortization    
Property, Plant and Equipment [Line Items]    
Effect of the foreign exchange gains upon settlement of cash flow hedges $ 57 $ 151