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Pension and Postretirement Benefits (Funded Status) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Postretirement Medical Benefits      
Funded status of plan:      
Benefit Obligation $ (12,417) $ (13,353) $ (17,021)
Funded status (12,417) (13,353)  
United States | Pension Plan      
Funded status of plan:      
Plan assets, at fair value 361,174 365,044 488,281
Benefit Obligation (417,648) (382,959) (471,825)
Funded status (56,474) (17,915)  
Foreign Plan | Pension Plan      
Funded status of plan:      
Plan assets, at fair value 179,450 172,276 275,941
Benefit Obligation (297,600) (268,364) $ (420,809)
Funded status $ (118,150) $ (96,088)