Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (73,540)	$ (54,059)
Foreign currency exchange rate fluctuations	379	(786)
Total intangibles assets, gross carrying amount	247,388	245,128
Total intangible assets, net carrying amount	174,227	190,283
In-process technology
Acquired Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	0	0
Foreign currency exchange rate fluctuations	0	0
Indefinite-lived intangible assets	3,900	3,900
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	133,456	133,358
Accumulated amortization	(30,421)	(20,930)
Foreign currency exchange rate fluctuations	297	(596)
Net carrying amount	$ 103,332	$ 111,832
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	1 year	1 year
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	30 years	30 years
Acquired technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 74,457	$ 73,599
Accumulated amortization	(19,493)	(13,287)
Foreign currency exchange rate fluctuations	75	(159)
Net carrying amount	$ 55,039	$ 60,153
Acquired technology | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	3 years	3 years
Acquired technology | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	20 years	20 years
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 21,702	$ 20,550
Accumulated amortization	(16,654)	(14,083)
Foreign currency exchange rate fluctuations	0	0
Net carrying amount	$ 5,048	$ 6,467
Backlog | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	1 year	1 year
Backlog | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	5 years	3 years
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 8,683	$ 8,667
Accumulated amortization	(4,508)	(3,887)
Foreign currency exchange rate fluctuations	13	(31)
Net carrying amount	$ 4,188	$ 4,749
Trade names | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	1 year	1 year
Trade names | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	12 years	12 years
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 3,290	$ 3,154
Accumulated amortization	(1,331)	(1,264)
Foreign currency exchange rate fluctuations	(6)	0
Net carrying amount	$ 1,953	$ 1,890
Patents | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	2 years	2 years
Patents | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	20 years	20 years
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,900	$ 1,900
Accumulated amortization	(1,133)	(608)
Foreign currency exchange rate fluctuations	0	0
Net carrying amount	$ 767	$ 1,292
Useful life (in years)	3 years	3 years