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Segment and Geographic Information - Segment Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
customer
Dec. 31, 2014
USD ($)
customer
Dec. 31, 2013
USD ($)
customer
Segment Reporting Information [Line Items]      
Document Fiscal Year Focus 2015    
Total sales $ 930,132 $ 956,280 $ 927,454
Gross profit $ 454,591 $ 448,155 $ 438,785
Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk Number of Customers Accounting For More Than Ten Percent of Revenue | customer 0 0 1
Top 10 Customers [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 25.30% 27.00% 25.00%
Operating Segments [Member] | Industry [Member]      
Segment Reporting Information [Line Items]      
Total sales $ 446,301 $ 450,198 $ 427,731
Gross profit 233,058 229,959 222,675
Operating Segments [Member] | Science [Member]      
Segment Reporting Information [Line Items]      
Total sales 483,831 506,082 499,723
Gross profit $ 221,533 $ 218,196 $ 216,110