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Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Additional Disclosures [Abstract] |  |  |  |
Total pre-tax share-based compensation expense (income) recognized in the Consolidated Statements of Earnings | $ 9,600 | $ 5,600 | $ (700) |
Tax related benefits (expense) | $ 1,000 | $ 800 | (200) |
Adjustments to share-based compensation |  |  | $ 3,600 |
Non-vested Stock [Member] |  |  |  |
Stock Unit Activity [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 451 | 404 | 380 |
Granted (in shares) | 129 | 142 | 134 |
Vested (in shares) | (25) | (27) | (46) |
Cancelled (in shares) | (73) | (68) | (64) |
Outstanding, end of period (in shares) | 482 | 451 | 404 |
Grant Date Weighted Average Fair Value [Abstract] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 63.28 | $ 64.89 | $ 66.02 |
Granted (in dollars per share) | 90.10 | 65.61 | 60.04 |
Vested (in dollars per share) | 61.91 | 74.21 | 63.61 |
Cancelled (in dollars per share) | 72.37 | 73.39 | 62.39 |
Outstanding, end of period (in dollars per share) | $ 69.15 | $ 63.28 | $ 64.89 |
Aggregate Intrinsic Value [Abstract] |  |  |  |
Outstanding, aggregate intrinsic value | $ 48,271 | $ 33,283 | $ 26,710 | $ 21,239
Additional Disclosures [Abstract] |  |  |  |
Total intrinsic values of shares vested | 1,900 | $ 1,400 | $ 3,000 |
Non-vested Stock and Performance Stock Units [Member] |  |  |  |
Additional Disclosures [Abstract] |  |  |  |
Compensation cost net yet recognized | $ 21,700 |  |  |
Compensation cost not yet recognized, period for recognition | 2 years 2 months 4 days |  |  |
2017 Stock Plan [Member] | Non-vested Stock [Member] |  |  |  |
Share-based Compensation Arrangement [Abstract] |  |  |  |
Number of shares authorized for issuance (in shares) | 1,800 |  |  |
Number of shares available for issuance (in shares) | 1,100 |  |  |
Award vesting period | 3 years |  |  |
Percentage of grants to elected officers that will be performance stock unit awards | 60.00% | 60.00% | 100.00% |
Percentage of grants, non-vested restricted stock awards | 40.00% | 40.00% |  |
Number of years to measure performance metrics | 3 years |  |  |
2017 Stock Plan [Member] | Non-vested Stock [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement [Abstract] |  |  |  |
Percentage of stated performance metrics award of grant | 200.00% | 200.00% | 200.00% | 150.00%
Amended and Restated Directors Deferred Compensation Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement [Abstract] |  |  |  |
Number of shares available for issuance (in shares) | 200 |  |  |

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