Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	$ 142,111	$ 137,178
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(19,250)	(21,165)
Pension and post-retirement benefit plan adjustments
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(921)	(1,112)
Unrealized income on interest rate swap contracts
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	1,278	1,982
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	$ (19,607)	$ (22,035)