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Pension Plans and Other Postretirement Benefits Financial Assets Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 659,874 | $ 606,957 |
Pension Plans | Domestic Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 163,160 | 146,683 |
Pension Plans | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 130,935 | 116,649 |
Pension Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 269,365 | 255,401 |
Pension Plans | Absolute Return Measured At Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 96,414 | 86,112 |
Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 2,112 |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 834 | 2,232 | $ 3,292
Other Postretirement Benefits | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 834 | 2,232 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 493,848 | 460,247 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Domestic Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 160,976 | 143,987 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 101,366 | 83,839 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 231,506 | 230,309 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Absolute Return Measured At Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 2,112 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Other Postretirement Benefits | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 69,612 | 60,598 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Domestic Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,184 | 2,696 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29,569 | 32,810 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 37,859 | 25,092 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Absolute Return Measured At Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 834 | 2,232 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Other Postretirement Benefits | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 834 | 2,232 |
Unobservable Inputs (Level 3) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Pension Plans | Domestic Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Pension Plans | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Pension Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Pension Plans | Absolute Return Measured At Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Unobservable Inputs (Level 3) | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Unobservable Inputs (Level 3) | Other Postretirement Benefits | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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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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