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Pension and Postretirement Benefits (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent liabilities	$ (225,994)	$ (199,603)
Postretirement Medical Benefits
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current liabilities	(2,342)	(2,370)
Noncurrent liabilities	(16,306)	(16,492)
Funded status	(18,648)	(18,862)
United States | Pension Plan
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	0	16,396
Current liabilities	(233)	(348)
Noncurrent liabilities	(9,505)	(4,957)
Funded status	(9,738)	11,091
Foreign Plan | Pension Plan
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	18,910	16,379
Current liabilities	(8,121)	(7,609)
Noncurrent liabilities	(193,479)	(171,828)
Funded status	$ (182,690)	$ (163,058)

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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