| **Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands** | 12 Months Ended |
|------------------------------------------------------------------------------|-----------------|
||
| Net income                                                                   | $ 249,539       | $ 337,091 | $ 377,375 |
| **Components of other comprehensive income (loss), net of tax:**             |            |   |   |
| Foreign currency translation adjustments                                     | 12,910          | 3,710 | (28,619) |
| **Pension and postretirement benefit plans:**                                |            |   |   |
| Prior service (cost) credit arising during the year                          | (6)             | (148) | (45) |
| Net actuarial loss arising during the year                                   | (21,607)        | (63,138) | (7,783) |
| Amortization of prior service cost                                           | (232)           | (322) | (322) |
| Amortization of actuarial loss                                               | 12,767          | 6,946 | 10,536 |
| Settlement loss recognized                                                   | 1,931           | 385 | 200 |
| Total pension and postretirement benefit plans                               | (7,147)         | (56,277) | 2,586 |
| Total other comprehensive income (loss)                                      | 5,763           | (52,567) | (26,033) |
| Total comprehensive income                                                   | 255,302         | 284,524 | 332,496 |
| ASU 2018-02                                                                  |            |   |   |
| **Pension and postretirement benefit plans:**                                |            |   |   |
| Reclassification due to adoption of ASU 2018-02                              | $ 0             | $ 0 | $ (18,846) |

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Cumulative Effect of Change in Accounting Principle
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Other comprehensive income loss finalization of pension and non pension postretirement plan valuation settlement loss net of tax.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).
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| - Definition
Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.
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| - Definition
Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.
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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.
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