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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance $ (628,879) $ (572,154) $ (641,972) $ (559,026)        
Other comprehensive income (loss) before reclassifications (3) 7,556 (58,745) 20,197 (73,531)        
Amounts reclassified from AOCL 536 1,184 988 2,842        
Other comprehensive income (loss) 8,092 (57,561) 21,185 (70,689)        
Ending balance (620,787) (629,715) (620,787) (629,715)        
Foreign currency translation, taxes (163) (7,299) 554 (20,605)        
Foreign currency translation items                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (541,177) (472,769) (554,683) (456,025)        
Other comprehensive income (loss) before reclassifications (3) 8,901 (64,160) 22,407 (80,904)        
Amounts reclassified from AOCL 0 0 0 0        
Other comprehensive income (loss) 8,901 (64,160) 22,407 (80,904)        
Ending balance (532,276) (536,929) (532,276) (536,929)        
Pension and other post-retirement effects                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (86,799) (98,078) (86,356) (101,665)        
Other comprehensive income (loss) before reclassifications (3) (1,345) 5,415 (2,210) 7,373        
Amounts reclassified from AOCL 506 1,155 928 2,784        
Other comprehensive income (loss) (839) 6,570 (1,282) 10,157        
Ending balance (87,638) (91,508) (87,638) (91,508)        
Cash flow hedging activity                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (903) (1,307) (933) (1,336)        
Other comprehensive income (loss) before reclassifications (3) 0 0 0 0        
Amounts reclassified from AOCL 30 29 60 58        
Other comprehensive income (loss) 30 29 60 58        
Ending balance (873) (1,278) (873) (1,278)        
Non- controlling Interests                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Other comprehensive income (loss) 245 4 (2,916) 1,340        
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax $ 2,900 5,900 $ 2,900 5,900 $ 2,700 $ 5,800 $ 5,900 $ 4,600
Non- controlling Interests | Currency Swap                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Foreign currency translation, taxes   $ 26,500   $ 35,100