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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net of tax | $ (2,741) | $ (2,400)
Amortization of actuarial losses |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassification | (3,059) | (2,657)
Prior service costs |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassification | (153) | (141)
Pension and other post-retirement effects |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Tax benefit | 471 | 398
Net of tax | $ (2,741) | $ (2,400)

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