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Pension and Postretirement Benefits (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Medical Benefits      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Balance — January 1 $ 656 $ 2,425  
Amortization of net loss (101) (164)  
Amortization of prior service cost 94 94  
Net (loss) gain arising during the year (1,862) (1,699)  
Prior service cost arising during the year (122) (122) $ (122)
Balance — December 31 (1,213) 656 2,425
United States | Pension Plan      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Balance — January 1 (49,510) (62,018)  
Amortization of net loss 5,336 2,809  
Amortization of prior service cost 140 125  
Net (loss) gain arising during the year (5,328) 9,785  
Settlement gain 98 0  
Prior service cost arising during the year (57) (211)  
Balance — December 31 (49,321) (49,510) (62,018)
Foreign Plan | Pension Plan      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Balance — January 1 (89,337) (62,088)  
Amortization of net loss 4,410 2,946  
Net (loss) gain arising during the year (7,432) (29,910)  
Prior service cost arising during the year (262) (265) (33)
Settlement losses 681 746  
Prior service cost arising during the year (467) 0  
Currency translation impact and other (5,101) (1,031)  
Balance — December 31 $ (97,246) $ (89,337) $ (62,088)