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Pensions - Schedule of Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | $ 450,713 | $ 444,228 | $ 449,019
Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 328,945 | 312,298 |
Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 10,687 | 17,831 |
Fair Value, Inputs, Level 1, 2 and 3 | Equity funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 92,689 | 88,118 |
Fair Value, Inputs, Level 1, 2 and 3 | U.S. treasuries and agencies |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 41,535 | 35,797 |
Fair Value, Inputs, Level 1, 2 and 3 | Corporate bond funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 184,034 | 170,552 |
Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 287,410 | 276,501 |
Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 10,687 | 17,831 |
Fair Value, Inputs, Level 1 | Equity funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 92,689 | 88,118 |
Fair Value, Inputs, Level 1 | U.S. treasuries and agencies |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 1 | Corporate bond funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 184,034 | 170,552 |
Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 41,535 | 35,797 |
Fair Value, Inputs, Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 2 | Equity funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 2 | U.S. treasuries and agencies |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 41,535 | 35,797 |
Fair Value, Inputs, Level 2 | Corporate bond funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 3 | Equity funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. treasuries and agencies |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Fair Value, Inputs, Level 3 | Corporate bond funds |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Hedge funds-investments measured at net asset value (“NAV”) as a practical expedient |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined benefit plan, plan assets, amount | $ 121,768 | $ 131,930 |

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