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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | $ 5,804,611 | $ 5,197,642 |
Before reclassifications to income |  | 19,336 |
Reclassifications to income | 14,402 | 16,290 |
Other comprehensive income (loss) | (27,172) | 35,626 | $ (147,544)
Balance at end of year | 4,394,147 | 5,804,611 | 5,197,642
Reclassifications before taxes, included in net periodic benefit expense | 1,525 | 6,335 |
Reclassifications, income tax expense | 321 | 1,330 |
Foreign Currency Translation Gains (Losses) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (353,252) | (419,852) |
Before reclassifications to income | 29,241 | 66,600 |
Reclassifications to income | 0 | 0 |
Other comprehensive income (loss) | 29,241 | 66,600 |
Balance at end of year | (324,011) | (353,252) | (419,852)
Retirement and Postretirement Benefit Plan Adjustments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (218,015) | (182,036) |
Before reclassifications to income | (70,815) | (47,264) |
Reclassifications to income | 13,198 | 11,285 |
Other comprehensive income (loss) | (57,617) | (35,979) |
Balance at end of year | (275,632) | (218,015) | (182,036)
Reclassifications before taxes, included in net periodic benefit expense | 17,694 | 14,380 |
Deferred Loss on Interest Rate Derivative Hedges |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (2,894) | (7,899) |
Before reclassifications to income | 0 | 0 |
Reclassifications to income | 1,204 | 5,005 |
Other comprehensive income (loss) | 1,204 | 5,005 |
Balance at end of year | (1,690) | (2,894) | (7,899)
Reclassifications, income tax expense | 4,496 | 3,095 |
Total |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (574,161) | (609,787) |
Before reclassifications to income | (41,574) |  |
Balance at end of year | $ (601,333) | $ (574,161) | $ (609,787)

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