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Pension and Postretirement Benefits (Change in Benefit Obligation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postretirement Medical Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Balance — January 1 | $ 13,353 | $ 17,021 |
Interest cost | 761 | 464 | $ 399
Employee contributions | 379 | 792 |
Medicare subsidies receivable | 60 | 0 |
Actuarial loss (gain) | (49) | (1,747) |
Benefits paid | (2,087) | (3,177) |
Balance — December 31 | 12,417 | 13,353 | 17,021
United States | Pension Plan |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Balance — January 1 | 382,959 | 471,825 |
Service cost | 21,341 | 24,680 | 25,162
Interest cost | 20,480 | 13,157 | 11,952
Plan amendments and settlements | (3,103) | 179 |
Actuarial loss (gain) | 31,912 | (87,791) |
Benefits paid | (35,941) | (39,091) |
Balance — December 31 | 417,648 | 382,959 | 471,825
Accumulated benefit obligations | 417,648 | 382,488 |
Foreign Plan | Pension Plan |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Balance — January 1 | 268,364 | 420,809 |
Service cost | 4,611 | 5,984 | 7,336
Interest cost | 11,897 | 6,506 | 5,544
Employee contributions | 80 | 71 |
Settlements and other | 982 | 7,944 |
Actuarial loss (gain) | 17,082 | (108,546) |
Benefits paid | (15,181) | (15,797) |
Currency translation impact | 11,729 | (32,719) |
Balance — December 31 | 297,600 | 268,364 | $ 420,809
Accumulated benefit obligations | $ 279,760 | $ 253,428 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 + Details
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