Intangible assets, net - Schedule Of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 301,216	$ 291,617
Accumulated Amortization	(179,946)	(168,324)
Net Carrying Amount	121,270	123,293
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	121,954	116,691
Accumulated Amortization	(36,684)	(30,345)
Net Carrying Amount	85,270	86,346
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	95,776	96,198
Accumulated Amortization	(88,842)	(87,341)
Net Carrying Amount	6,934	8,857
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,733	33,163
Accumulated Amortization	(20,865)	(19,931)
Net Carrying Amount	12,868	13,232
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,753	45,565
Accumulated Amortization	(33,555)	(30,707)
Net Carrying Amount	$ 16,198	$ 14,858