Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, net - Deprecation Expense (Details)

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Property and Equipment, net - Deprecation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]    
Total depreciation expense $ 14,153 $ 12,668
Cost of sales    
Property, Plant and Equipment [Line Items]    
Total depreciation expense 8,934 8,067
Sales and marketing expenses    
Property, Plant and Equipment [Line Items]    
Total depreciation expense 1,002 788
Product development    
Property, Plant and Equipment [Line Items]    
Total depreciation expense 835 686
General and administrative    
Property, Plant and Equipment [Line Items]    
Total depreciation expense $ 3,382 $ 3,127