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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax stock-based compensation expense | $ 14,291 | $ 11,286 | $ 10,986
Income tax benefits | (3,218) | (1,778) | (3,969)
Total stock-based compensation expense, net of tax | 11,073 | 9,508 | 7,017
Cost of Sales [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax stock-based compensation expense | 250 | 243 | 233
Selling, General and Administrative Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax stock-based compensation expense | $ 14,041 | $ 11,043 | $ 10,753

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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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