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Accumulated Other Comprehensive Income - Amount reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Income tax expense $ (2,213) $ (3,507) $ (4,418) $ (7,116)
Net Income (Loss) 11,369 15,987 22,293 31,967
Amount reclassified from accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net Income (Loss) (147) (147) (74) (294)
Retirement plans | Amount reclassified from accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Change in funded status of post retirement benefits, net of taxes (195) (196) (98) (392)
Income tax expense 48 49 24 98
Net Income (Loss) $ (147) $ (147) $ (74) $ (294)