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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
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 $ 2,265 $ 1,470 $ 6,800 $ 8,137
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 198 120 520 563
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 $ 2,067 $ 1,350 $ 6,280 $ 7,574