Retirement Plans and Postretirement Medical Benefits (Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
United States
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 991,154	$ 1,001,811
Accumulated benefit obligation	991,154	1,001,801
Fair value of plan assets	940,928	958,812
Foreign
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	383,913	368,417
Accumulated benefit obligation	381,867	366,197
Fair value of plan assets	$ 318,757	$ 299,912