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Employee Benefit and Deferred Compensation Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Retirement Benefits [Abstract] |  |
Stock options granted (in shares) | 0 | 0
Treasury shares reissued (in shares) | 93,859 |
Total stock-based compensation expense | $ 2,756 | $ 2,750

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