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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | $ 4,394,147 |
Components of other comprehensive income (loss): |  |
Before reclassifications to income and retained earnings | 19,897 |
Reclassifications to income | 5,826 |
Other comprehensive (loss) income | 25,723 | $ (127,823)
Balance at end of period | 4,099,609 | $ 5,098,303
Reclassifications before taxes, included in net periodic benefit expense | 2,140 |
Reclassifications, income tax expense | 450 |
Foreign Currency Translation Gains (Losses) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (324,011) |
Components of other comprehensive income (loss): |  |
Before reclassifications to income and retained earnings | 19,897 |
Reclassifications to income | 0 |
Other comprehensive (loss) income | 19,897 |
Balance at end of period | (304,114) |
Retirement and Postretirement Benefit Plan Adjustments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (275,632) |
Components of other comprehensive income (loss): |  |
Before reclassifications to income and retained earnings | 0 |
Reclassifications to income | 4,136 |
Other comprehensive (loss) income | 4,136 |
Balance at end of period | (271,496) |
Reclassifications before taxes, included in net periodic benefit expense | 5,252 |
Deferred Loss on Interest Rate Derivative Hedges |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (1,690) |
Components of other comprehensive income (loss): |  |
Before reclassifications to income and retained earnings | 0 |
Reclassifications to income | 1,690 |
Other comprehensive (loss) income | 1,690 |
Balance at end of period | 0 |
Reclassifications, income tax expense | 1,116 |
Total |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (601,333) |
Components of other comprehensive income (loss): |  |
Balance at end of period | $ (575,610) |

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