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Accumulated Other Comprehensive Loss (Reclassification) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (expense), net | $ 3,513 | $ (592) | $ (994)
Income tax (expense) benefit | (18,544) | (7,807) | (22,938)
Net income | 49,990 | 47,319 | $ 87,651
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Amortization/settlement of pension and other postretirement benefits |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Pension settlement charges | 63 | (53,213) |
Other income (expense), net | (315) | (504) |
Income tax (expense) benefit | 56 | 9,393 |
Net income | (196) | (44,324) |
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Unrealized gain (loss) on derivative instruments |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (expense), net | (3,191) | 200 |
Income tax (expense) benefit | 715 | (45) |
Net income | $ (2,476) | $ 155 |

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