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Share-Based Employee Compensation - Amounts Recognized for Share-Based Compensation (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
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 $ 1,861 $ 3,435
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 156 249
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 $ 1,705 $ 3,186
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Number of stock units granted (in shares) 125 226
Cost of employee share-based compensation included in income, before income tax $ 245 $ 1,636
Performance Share Units with Total Shareholder Return Conditions    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Number of stock units granted (in shares) 125 149