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Components of Accumulated Other Comprehensive Income (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period $ 2,263,153 $ 1,526,133
Reclassifications from AOCI to earnings:    
Balance, end of period 2,171,098 2,263,153
Pension and Other Postretirement Employee Benefits [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period (28,494) (51,369)
Unrecognized gains (losses) arising in AOCI during the period:    
Gross 13,744 10,825
Tax effect (3,436) (2,760)
Reclassifications from AOCI to earnings:    
Pension settlement [1] 0 14,165
Other [1] (703) 5,715
Tax effect 175 (5,070)
Net of tax amount 9,780 22,875
Other reclassifications (211) 0
Balance, end of period (18,925) (28,494)
Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 126,146 8,131
Unrecognized gains (losses) arising in AOCI during the period:    
Gross 14,225 117,761
Tax effect (446) 871
Reclassifications from AOCI to earnings:    
Gross [2] (19,354) 1,241
Tax effect 449 (116)
Net of tax amount (4,234) 118,015
Other reclassifications 45 0
Balance, end of period 121,957 126,146
'Accumulated Other Comprehensive Income [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 97,652 (43,238)
Reclassifications from AOCI to earnings:    
Balance, end of period $ 103,032 $ 97,652
[1] Included in the computation of net periodic pension costs.
[2] Included in Interest expense, net on the Consolidated Statements of Operations.