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Pension and Postretirement Benefits (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Postretirement Medical Benefits      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Balance — January 1 $ (496) $ (2,072)  
Amortization of net (gain) loss 41 147  
Net loss arising during the year 37 1,336  
Amortization of prior service cost (93) (93)  
Prior service cost arising during the year 122 122 $ 122
Balance — December 31 (325) (496) (2,072)
United States | Pension Plan      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Balance — January 1 (44,455) (30,014)  
Amortization of net (gain) loss (10) 2,647  
Net loss arising during the year (20,362) (17,085)  
Settlement loss and other 2,140 0  
Amortization of prior service cost (141) (134)  
Prior service cost arising during the year 56 137  
Balance — December 31 (62,602) (44,455) (30,014)
Foreign Plan | Pension Plan      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Balance — January 1 (42,421) (70,581)  
Amortization of net (gain) loss 1,631 2,450  
Net loss arising during the year (16,039) 21,099  
Settlement (gains) losses 23 (130)  
Currency translation impact and other (3,126) 4,714  
Prior service cost arising during the year 300 293 300
Prior service gain (cost) arising during the year (10) 233  
Balance — December 31 $ (59,968) $ (42,421) $ (70,581)