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
Mar. 31, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]    
Total depreciation expense $ 12,668 $ 10,323
Cost of sales    
Property, Plant and Equipment [Line Items]    
Total depreciation expense 8,067 6,214
Sales and marketing expenses    
Property, Plant and Equipment [Line Items]    
Total depreciation expense 788 831
Product development    
Property, Plant and Equipment [Line Items]    
Total depreciation expense 686 577
General and administrative    
Property, Plant and Equipment [Line Items]    
Total depreciation expense $ 3,127 $ 2,701