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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net of tax $ (882) $ 462 $ (6,131) $ 1,412
Amortization of actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (724) 321 (2,033) 985
Prior service costs        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (158) 151 (464) 455
Pension and other post-retirement effects        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit (expense) 23 20 (26) 62
Net of tax (859) 492 (2,523) 1,502
Cash flow hedging activity        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (30) (37) (92) (111)
Tax benefit (expense) 7 7 50 21
Net of tax $ (23) $ (30) $ (42) $ (90)