Pension and Postretirement Benefits (Funded Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement Medical Benefits
Funded status of plan:
Benefit Obligation	$ (17,021)	$ (18,648)	$ (18,862)
Funded status	(17,021)	(18,648)
United States | Pension Plan
Funded status of plan:
Plan assets, at fair value	488,281	477,680	482,553
Benefit Obligation	(471,825)	(487,418)	(471,462)
Funded status	16,456	(9,738)
Foreign Plan | Pension Plan
Funded status of plan:
Plan assets, at fair value	275,941	287,308	262,559
Benefit Obligation	(420,809)	(469,998)	$ (425,617)
Funded status	$ (144,868)	$ (182,690)