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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification of loss on pension settlement $ 42,657 $ 0 $ 42,657 $ 0
Amortization of prior service credit (1,123) (1,119) (3,368) (3,356)
Net actuarial loss 967 1,103 2,905 3,320
Income before income taxes 7,640 43,831 100,540 126,367
Income tax effect 3,183 (12,889) (22,273) (36,375)
Net income attributable to the Company 10,694 30,862 77,632 89,842
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 (106) 1,803 2,758 5,049
Income tax effect (27) (466) (752) (1,304)
Net income attributable to the Company (133) 1,337 2,006 3,745
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement liability adjustments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification of loss on pension settlement 42,657 0 42,657 0
Amortization of prior service credit (1,123) (1,119) (3,368) (3,356)
Net actuarial loss 967 1,103 2,905 3,320
Income before income taxes 42,501 (16) 42,194 (36)
Income tax effect (16,411) 5 (16,317) 11
Net income attributable to the Company $ 26,090 $ (11) $ 25,877 $ (25)