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Pensions - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Settlement (gain)/loss | $ 0 | $ (24) | $ 15 | $ (24)
Defined Benefit Plan, Type [Extensible List] | Pension Plan |  | Pension Plan |
Qualified Plan | Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contribution costs | $ 10,000 | 12,200 | $ 15,000 | 15,800
Expected future employer contribution, current fiscal year | 25,000 |  | 25,000 |
Nonqualified Plan | Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contribution costs | 200 | $ 200 | 900 | $ 700
Expected future employer contribution, current fiscal year | $ 1,400 |  | $ 1,400 |

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