Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, net - Finite-Lived Intangible Assets (Details)

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Intangible Assets, net - Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value $ 236,923 $ 254,409
Accumulated amortization 144,713 131,827
Net carrying value $ 92,210 $ 122,582
Existing technology -- software    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 5 years 2 months 10 days 4 years 9 months
Gross carrying value $ 42,299 $ 42,999
Accumulated amortization 26,768 20,209
Net carrying value $ 15,531 $ 22,790
Existing technology -- games    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives   5 years
Gross carrying value   $ 12,331
Accumulated amortization   12,125
Net carrying value   $ 206
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 8 years 8 years
Gross carrying value $ 7,317 $ 7,317
Accumulated amortization 4,573 3,887
Net carrying value $ 2,744 $ 3,430
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 8 years 1 month 6 days 7 years 11 months
Gross carrying value $ 166,616 $ 170,716
Accumulated amortization 98,402 85,160
Net carrying value $ 68,214 $ 85,556
Backlog    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 3 years 3 years
Gross carrying value $ 18,300 $ 18,300
Accumulated amortization 13,217 8,642
Net carrying value $ 5,083 $ 9,658
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 5 years 1 month 6 days 4 years 6 months
Gross carrying value $ 2,391 $ 2,746
Accumulated amortization 1,753 1,804
Net carrying value $ 638 $ 942
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 2 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 10 years  
Weighted average    
Finite-Lived Intangible Assets [Line Items]    
Weighted average useful lives 7 years 1 month