Acquisitions - Narrative (Details) € in Thousands, £ in Thousands, SFr in Thousands, $ in Thousands				1 Months Ended	3 Months Ended					9 Months Ended	12 Months Ended
	Apr. 03, 2017 USD ($)	Aug. 31, 2016 CHF (SFr)	Aug. 31, 2016 USD ($)	Jul. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 GBP (£)	Sep. 30, 2018 USD ($)	Sep. 30, 2016 subsidiary	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jul. 23, 2018 USD ($)	Dec. 31, 2016 USD ($)	Aug. 31, 2016 USD ($)
Business Acquisition [Line Items]
Period of acquisitions											3 years
Number of subsidiaries included in business acquisition | subsidiary									3
Acquisition related costs											$ 5,420
Goodwill										$ 690,223		$ 690,223	$ 955,524				$ 633,436
Acquisition-related goodwill											285,355	3,330
Gimatic and IGS [Member]
Business Acquisition [Line Items]
Acquisition-related costs adjustment												5,420
Inventory adjustment												10,905
IGS
Business Acquisition [Line Items]
Aggregate purchase price							£ 29,138	$ 38,016
Adjustments under terms of Share Purchase Agreement							£ 2,820								$ 3,679
Sales since date of acquisition											6,360
Loss since date of acquisition											1,726
Short-term purchase accounting adjustments											2,887
Other intangible assets																$ 15,300
Goodwill																$ 14,098
Acquisition-related goodwill								14,098
Intangible assets acquired				$ 15,300				$ 15,300
Gimatic
Business Acquisition [Line Items]
Aggregate purchase price					€ 362,352	$ 409,893
Adjustments under terms of Share Purchase Agreement					7,790								$ 8,812
Cash paid					357,994	404,962
Liabilities incurred					€ 4,358	4,931
Sales since date of acquisition											8,793
Loss since date of acquisition											2,109
Short-term purchase accounting adjustments											2,707
Other intangible assets														$ 158,800
Goodwill														$ 271,257
Acquisition-related goodwill						271,257
Intangible assets acquired						$ 158,800
Gammaflux L.P. [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 8,866
Adjustments under terms of Share Purchase Agreement	2
Acquisition related costs											$ 210
Sales since date of acquisition										$ 9,081
Other intangible assets	3,700
Goodwill	$ 1,535
FOBOHA Business [Member]
Business Acquisition [Line Items]
Adjustments under terms of Share Purchase Agreement		SFr 11,342																$ 11,530
Cash paid		SFr 137,918	$ 140,203
Acquisition related costs												2,193
Sales since date of acquisition												$ 18,348
Other intangible assets																		39,800
Goodwill																		$ 75,574