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Share-Based Employee Compensation - Amounts Recognized for Share-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 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 $ 2,052 $ 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 142 337
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 $ 1,910 $ 5,033