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Acquisitions and Divestitures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 23, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]            
Goodwill   $ 1,697,332   $ 1,697,332   $ 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   $ 400 $ 800 $ 700 $ 1,500