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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net of tax $ (1,184) $ (2,787) $ (2,842) $ (5,731)
Amortization of actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (1,468) (3,089) (3,200) (6,148)
Prior service costs        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (144) (155) (295) (308)
Pension and other post-retirement effects        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit 457 472 711 942
Net of tax (1,155) (2,772) (2,784) (5,514)
Cash flow hedging activity        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification (38) (20) (76) (284)
Tax benefit 9 5 18 67
Net of tax $ (29) $ (15) $ (58) $ (217)