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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ (559,026) $ (603,648)    
Other comprehensive income (loss) before reclassifications (3) (14,787) (9,371)    
Amounts reclassified from AOCL 1,659 2,943    
Other comprehensive income (loss) (13,128) (6,428)    
Ending balance (572,154) (610,076)    
Foreign currency translation items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (456,025) (456,437)    
Other comprehensive income (loss) before reclassifications (3) (16,744) (10,889)    
Amounts reclassified from AOCL 0 0    
Other comprehensive income (loss) (16,744) (10,889)    
Ending balance (472,769) (467,326)    
Pension and other post-retirement effects        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (101,665) (146,723)    
Other comprehensive income (loss) before reclassifications (3) 1,957 1,518    
Amounts reclassified from AOCL 1,630 2,741    
Other comprehensive income (loss) 3,587 4,259    
Ending balance (98,078) (142,464)    
Cash flow hedging activity        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (1,336) (488)    
Other comprehensive income (loss) before reclassifications (3) 0 0    
Amounts reclassified from AOCL 29 202    
Other comprehensive income (loss) 29 202    
Ending balance (1,307) (286)    
Non- controlling Interests        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Other comprehensive income (loss) 1,336 147    
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax 5,900 6,100 $ 4,600 $ 5,900
Non- controlling Interests | Currency Swap        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax $ 8,600 $ (200)