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Employee Benefit and Deferred Compensation Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Retirement Benefits [Abstract] |  |  |  |
Stock options granted (in shares) |  |  | 0 | 0
Treasury shares reissued (in shares) |  |  | 126,147 |
Total stock-based compensation expense | $ 2,385 | $ 2,998 | $ 5,141 | $ 5,748

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