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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Loss        
Accumulated other comprehensive loss $ 176,830 $ 169,862 $ 122,119 $ 154,496
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Loss        
Accumulated other comprehensive loss (20,268) (20,183) $ (22,191) $ (17,767)
Pension and post-retirement benefit plan adjustments        
Accumulated Other Comprehensive Loss        
Accumulated other comprehensive loss (4,008) (2,959)    
Unrealized loss on interest rate swap contracts        
Accumulated Other Comprehensive Loss        
Accumulated other comprehensive loss (766) (230)    
Foreign currency translation adjustments        
Accumulated Other Comprehensive Loss        
Accumulated other comprehensive loss $ (15,494) $ (16,994)