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Pensions and Other Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | $ 180,672 | $ 171,387
Fair value of plan assets, end of year | 205,586 | 180,672
Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | 2,238 | 2,403
Net realized gains |  |
Net unrealized gains | 56 | 26
Net purchases, issuances and settlements | 113 | (191)
Net transfers (out of) Level 3 |  |
Fair value of plan assets, end of year | 2,407 | 2,238
Insurance Contracts [Member] | United States [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | 2,238 |
Net realized gains |  |
Net unrealized gains | 56 |
Net purchases, issuances and settlements | 113 |
Net transfers (out of) Level 3 |  |
Fair value of plan assets, end of year | 2,407 | 2,238
Insurance Contracts [Member] | Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | 2,238 |
Fair value of plan assets, end of year | 2,407 | 2,238
Insurance Contracts [Member] | Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | 2,238 | 2,403
Net realized gains |  |
Net unrealized gains |  | 26
Net purchases, issuances and settlements |  | (191)
Net transfers (out of) Level 3 |  |
Fair value of plan assets, end of year | $ 2,407 | $ 2,238

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(C) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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