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Pension Plans and Other Postretirement Benefits Financial Assets Accounted for at Fair Value on Recurring Basis (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 683,469 | $ 638,149
Quoted Prices in Active Markets for Identical Items (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 527,104 | 493,267
Quoted Prices in Active Markets for Identical Items (Level 1) | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 140,548 | 118,255
Quoted Prices in Active Markets for Identical Items (Level 1) | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 113,174 | 95,246
Quoted Prices in Active Markets for Identical Items (Level 1) | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 270,589 | 279,731
Quoted Prices in Active Markets for Identical Items (Level 1) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 35
Quoted Prices in Active Markets for Identical Items (Level 1) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,793 |
Quoted Prices in Active Markets for Similar Items (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 77,578 | 71,105
Quoted Prices in Active Markets for Similar Items (Level 2) | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,732 | 1,587
Quoted Prices in Active Markets for Similar Items (Level 2) | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 26,437 | 31,582
Quoted Prices in Active Markets for Similar Items (Level 2) | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 49,409 | 37,936
Quoted Prices in Active Markets for Similar Items (Level 2) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Quoted Prices in Active Markets for Similar Items (Level 2) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Unobservable Inputs (Level 3) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Absolute Return Measured at Net Asset Value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 78,787 | 73,777
Fair Value, Inputs, Level 1, 2 and 3 | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 142,280 | 119,842
Fair Value, Inputs, Level 1, 2 and 3 | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 139,611 | 126,828
Fair Value, Inputs, Level 1, 2 and 3 | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 319,998 | 317,667
Fair Value, Inputs, Level 1, 2 and 3 | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | $ 35
Fair Value, Inputs, Level 1, 2 and 3 | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,793 |

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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. + 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 (d)(iv)(01) -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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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