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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 13,724 $ 16,432 $ 27,877 $ 29,115
Cost of sales        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 8,662 11,475 17,596 19,557
Sales and marketing expenses        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 912 1,065 1,914 1,830
Product development        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 772 967 1,607 1,629
General and administrative        
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 3,378 $ 2,925 $ 6,760 $ 6,099