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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance - January 1 $ (579,196) $ (569,430)  
Other comprehensive income (loss) before reclassifications (18,408) (15,775)  
Amounts reclassified from AOCL 9,417 6,009  
Other comprehensive income (loss) (8,991) (9,766) $ (67,806)
Balance - December 31 (588,187) (579,196) (569,430)
Accumulated net loss from net investment hedge, net of tax 48,800 12,100  
Net of tax (9,417) (6,009)  
Foreign Currency Translation Items      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance - January 1 (441,364) (447,925)  
Other comprehensive income (loss) before reclassifications 388 6,561  
Amounts reclassified from AOCL 0 0  
Other comprehensive income (loss) 388 6,561  
Balance - December 31 (440,976) (441,364) (447,925)
Net of tax 0 0  
Pension and other post-retirement effects      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance - January 1 (137,161) (120,647)  
Other comprehensive income (loss) before reclassifications (18,979) (22,523)  
Amounts reclassified from AOCL 9,417 6,009  
Other comprehensive income (loss) (9,562) (16,514)  
Balance - December 31 (146,723) (137,161) (120,647)
Amount of settlement of reclassification adjustment from accumulated other comprehensive income (loss) (836) (859)  
Tax benefit 3,148 1,887  
Net of tax (9,417) (6,009)  
Cash flow hedging activity      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance - January 1 (671) (858)  
Other comprehensive income (loss) before reclassifications 183 187  
Amounts reclassified from AOCL 0 0  
Other comprehensive income (loss) 183 187  
Balance - December 31 (488) (671) (858)
Net of tax 0 0  
Noncontrolling Interests      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Other comprehensive income (loss) 769 579 668
Foreign currency translation adjustments, attributable to noncontrolling interest 5,900 5,100 $ 4,500
Amortization of actuarial losses      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax (11,161) (6,608)  
Prior service costs      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax $ (568) $ (429)