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Stock-Based Compensation Plans Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | $ 7,529 | $ 7,413 | $ 7,965
Tax benefits as a percentage of compensation expense | 21.40% | 21.70% | 33.00%
Statutory tax rate | 21.00% | 21.00% | 21.00%
Stock Options And Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | $ 8,381 | $ 7,413 | $ 7,965
Tax benefit | (1,790) | (1,610) | (2,625)
Total stock-based compensation, net of tax | $ 6,591 | $ 5,803 | $ 5,340

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