Quarterly report pursuant to Section 13 or 15(d)

Property, Plant, and Equipment, net - Deprecation Expense (Details)

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Property, Plant, and Equipment, net - Deprecation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 16,432 $ 11,189 $ 29,115 $ 21,512
Cost of sales        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 11,475 7,378 19,557 13,592
Sales and marketing expenses        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 1,065 622 1,830 1,453
Product development        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 967 607 1,629 1,184
General and administrative        
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 2,925 $ 2,582 $ 6,099 $ 5,283