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Segment Information (Product Category Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue from External Customer [Line Items]      
Net sales $ 1,337,991 $ 1,280,986 $ 1,344,777
Consumables and related revenues      
Revenue from External Customer [Line Items]      
Net sales 1,166,131 1,114,580 1,172,728
Instrumentation      
Revenue from External Customer [Line Items]      
Net sales $ 171,860 $ 166,406 $ 172,049