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Benefit Plans - Accumulated Other Comprehensive loss (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan |  |  |
Amounts within accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit cost |  |  |
Net actuarial loss (gain) | $ 36,357 | $ 44,351 |
Total, pretax effect | 36,357 | 44,351 |
Tax impact | (9,698) | (11,831) |
Ending balance in accumulated other comprehensive loss | 26,659 | 32,520 |
Other Benefits |  |  |
Amounts within accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit cost |  |  |
Net actuarial loss (gain) | (3,094) | (1,068) | $ (1,582)
Total, pretax effect | (3,094) | (1,068) |
Tax impact | 825 | 285 |
Ending balance in accumulated other comprehensive loss | $ (2,269) | $ (783) |

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