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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 583,659 | $ 659,874 |
Pension Plans | Domestic Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 113,355 | 163,160 |
Pension Plans | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 114,554 | 130,935 |
Pension Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 254,437 | 269,365 |
Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29,326 |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 834 | $ 2,232
Other Postretirement Benefits | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 834 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 450,766 | 493,848 |
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 | 111,665 | 160,976 |
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 | 90,651 | 101,366 |
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 | 219,124 | 231,506 |
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29,326 |  |
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 |
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 60,906 | 69,612 |
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 | 1,690 | 2,184 |
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 | 23,903 | 29,569 |
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 | 35,313 | 37,859 |
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 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 834 |
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 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Unobservable Inputs (Level 3) | Other Postretirement Benefits | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Absolute Return Measured at Net Asset Value | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 71,987 | $ 96,414 |

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