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Pension and Postretirement Benefits (Funded Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Postretirement Medical Benefits
Funded status of plan:
Benefit Obligation	$ (18,648)	$ (18,862)	$ (18,810)
Funded status	(18,648)	(18,862)
United States | Pension Plan
Funded status of plan:
Plan assets, at fair value	477,680	482,553	425,792
Benefit Obligation	(487,418)	(471,462)	(432,595)
Funded status	(9,738)	11,091
Foreign Plan | Pension Plan
Funded status of plan:
Plan assets, at fair value	287,308	262,559	232,175
Benefit Obligation	(469,998)	(425,617)	$ (376,649)
Funded status	$ (182,690)	$ (163,058)

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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-Publisher FASB
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-SubTopic 20
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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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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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