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