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Share-Based Employee Compensation - Amounts Recognized for Share-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Cost of employee share-based compensation included in income, before income tax $ 3,512 $ 4,181 $ 9,975 $ 9,551
Cost of sales        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Cost of employee share-based compensation included in income, before income tax 253 287 722 650
Operating expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Cost of employee share-based compensation included in income, before income tax $ 3,259 $ 3,894 $ 9,253 $ 8,901