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Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax effect $ (12,889) $ (9,686) $ (36,375) $ (37,504)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income 30,862 29,589 89,842 71,052
Pension/postretirement settlements and curtailments 0 0 0 378
Amortization of prior service credit (1,119) (1,114) (3,356) (3,342)
Net actuarial loss/ (gain) 1,103 1,244 3,320 3,720
Total pretax amount reclassified 43,831 39,276 126,367 107,137
Reclassification out of Accumulated Other Comprehensive Income | Derivative valuation adjustment        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Expense/(income) related to interest rate swaps included in Income before taxes 1,803 1,219 5,049 2,742
Income tax effect (466) (311) (1,304) (701)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income 1,337 908 3,745 2,041
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement liability adjustments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax effect 5 (32) 11 (207)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income (11) 98 (25) 549
Pension/postretirement settlements and curtailments 0 0 0 378
Amortization of prior service credit (1,119) (1,114) (3,356) (3,342)
Net actuarial loss/ (gain) 1,103 1,244 3,320 3,720
Total pretax amount reclassified $ (16) $ 130 $ (36) $ 756