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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 15,035 $ 12,010 $ 44,149 $ 33,522
Cost of sales        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 10,019 7,666 29,576 21,259
Sales and marketing expenses        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 917 703 2,764 2,165
Product development        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 872 1,687 2,396 2,838
General and administrative        
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 3,227 $ 1,954 $ 9,413 $ 7,260