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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax stock-based compensation expense | $ 17,832 | $ 14,291 | $ 11,286
Income tax benefits | (4,009) | (3,218) | (1,778)
Total stock-based compensation expense, net of tax | 13,823 | 11,073 | 9,508
Cost of Sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax stock-based compensation expense | 278 | 250 | 243
Selling, General and Administrative Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax stock-based compensation expense | $ 17,554 | $ 14,041 | $ 11,043

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