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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax stock-based compensation expense | $ 4,949,000 | $ 4,037,000 | $ 9,823,000 | $ 7,712,000
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax stock-based compensation expense | 1,861,000 | 1,755,000 | 3,771,000 | 3,459,000
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax stock-based compensation expense | $ 3,088,000 | $ 2,282,000 | $ 6,052,000 | $ 4,253,000

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