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Employee Benefits and Share-Based Compensation - Shared-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense $ 21,857 $ 19,500 $ 14,921
Cost of product and service revenues      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense 3,478 2,596 2,111
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense 3,590 3,128 2,060
Selling, general and administrative      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense 14,789 13,776 10,750
2009 Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Income tax benefit $ 8,200 $ 5,400 $ 5,000