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Share-Based Compensation - Schedule of Compensation Cost for Performance Share Units (Details) - Performance Shares Units - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total expense before income taxes $ 8,203 $ 6,925 $ 5,559
Income tax benefit (1,586) (2,342) (1,859)
Total expense after income taxes 6,617 4,583 3,700
Cost of goods sold      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total expense before income taxes 0 0 0
Selling, general and administrative expenses      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total expense before income taxes $ 8,203 $ 6,925 $ 5,559