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Pensions - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Settlement loss | $ 986 | $ 719 | $ 1,010 | $ 719
Remeasurement loss | $ 29,461 | 13,616 | $ 30,200 | 13,616
Defined Benefit Plan, Type [Extensible List] | us-gaap:PensionPlansDefinedBenefitMember |  | us-gaap:PensionPlansDefinedBenefitMember |
Qualified Plan | Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contribution costs | $ 9,900 | 22,100 | $ 25,700 | 25,700
Expected future employer contribution, current fiscal year | 30,900 |  | 30,900 |
Nonqualified Plan | Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contribution costs | 200 | $ 300 | 800 | $ 600
Expected future employer contribution, current fiscal year | $ 1,400 |  | $ 1,400 |

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