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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net of tax $ (536) $ (1,184) $ (988) $ (2,842)
Amortization of actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (381) (1,468) (664) (3,200)
Prior service costs        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (154) (144) (305) (295)
Pension and other post-retirement effects        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit 29 457 41 711
Net of tax (506) (1,155) (928) (2,784)
Cash flow hedging activity        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (37) (29) (74) (58)
Tax benefit 7 0 14 0
Net of tax $ (30) $ (29) $ (60) $ (58)