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Pension and Postretirement Benefits (Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Postretirement Medical Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net gain (loss)	$ (470)	$ 1,512
Unrecognized prior service cost	(743)	(856)
Accumulated other comprehensive loss, net of tax	(1,213)	656	$ 2,425
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net gain (loss)	(48,460)	(48,578)
Unrecognized prior service cost	(861)	(932)
Accumulated other comprehensive loss, net of tax	(49,321)	(49,510)	(62,018)
Foreign Plan | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net gain (loss)	(93,417)	(85,891)
Unrecognized prior service cost	(3,829)	(3,446)
Accumulated other comprehensive loss, net of tax	$ (97,246)	$ (89,337)	$ (62,088)

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- Definition

Accumulated other comprehensive income (loss), unrecognized net income (loss)

+ References

No definition available.

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- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

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- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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