Pensions - Cash Contributions to Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan contributions	$ 36,185	$ 44,908
Qualified Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan contributions	35,000	43,875	$ 29,635
Nonqualified Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan contributions	$ 1,176	$ 1,034	$ 734