Pension and Postretirement Benefits (Funded Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Funded status of plan:
Fair value of plan assets	$ 397,850	$ 384,006
Postretirement Medical Benefits
Funded status of plan:
Benefit obligation	(7,896)	(11,761)	$ (12,417)
Funded status	7,896	11,761
United States | Pension Plan
Funded status of plan:
Plan assets, at fair value	362,507	352,517	361,174
Benefit obligation	(405,925)	(415,236)	(417,648)
Funded status	(43,418)	(62,719)
Foreign Plan | Pension Plan
Funded status of plan:
Plan assets, at fair value	165,942	167,508	179,450
Benefit obligation	(294,422)	(285,498)	$ (297,600)
Funded status	$ (128,480)	$ (117,990)