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Share-Based Employee Compensation - Amounts Recognized for Share-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ 3,464 $ 2,185 $ 6,464 $ 5,370
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 256 146 470 363
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 $ 3,208 $ 2,039 $ 5,994 $ 5,007