Acquisitions and Divestitures (Details) - USD ($) $ in Thousands		3 Months Ended
	Jul. 23, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 1,694,408		$ 1,697,955
Finger Lakes Instrumentation (FLI)
Business Acquisition [Line Items]
Consideration transferred	$ 23,600
Aggregate purchase price, cash paid	20,200
Contingent consideration	$ 3,400
Contingent consideration arrangements, period	24 months
Goodwill	$ 12,600
Intangible assets	$ 7,900
Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition-related transaction costs		$ 300	$ 700