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Pensions and Other Postretirement Benefit Plans (Schedule of Plan Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | $ 211,755 | $ 178,942
Actual return on plan assets, net of expenses | 28,477 | 32,367
Employer contributions | 3,219 | 4,670
Plan participants' contributions | 198 | 243
Benefits paid | (8,123) | (8,404)
Settlements | (737) | (260)
Foreign currency changes | 4,262 | 4,197
Fair value of plan assets, end of year | 239,051 | 211,755
Other postretirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | 0 | 0
Actual return on plan assets, net of expenses | 0 | 0
Employer contributions | 3,555 | 3,782
Plan participants' contributions | 0 | 0
Benefits paid | (3,555) | (3,782)
Settlements | 0 | 0
Foreign currency changes | 0 | 0
Fair value of plan assets, end of year | $ 0 | $ 0

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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