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Equity Compensation and Employee Benefit Plans (Equity Compensation Expense and Related Income Tax Benefit Recognized) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |
Equity Compensation [Abstract] |  |  |
Pre-tax compensation expense | $ 5,409 | $ 4,943 | $ 4,143
Tax benefit | 1,379 | 1,258 | 1,056
Stock expense, net of tax | 4,030 | 3,685 | 3,087
Performance Shares |  |  |
Equity Compensation [Abstract] |  |  |
Pre-tax compensation expense | 3,503 | 3,156 | 3,152
Tax benefit | 893 | 803 | 804
Stock expense, net of tax | $ 2,610 | $ 2,353 | $ 2,348

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