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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, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period $ 2,171,098 $ 2,263,153
Reclassifications from AOCI to earnings:    
Balance, end of period 2,037,670 2,171,098
Pension and Other Postretirement Employee Benefits [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period (18,925) (28,494)
Unrecognized gains (losses) arising in AOCI during the period:    
Gross (11,743) 13,744
Tax effect 2,936 (3,436)
Reclassifications from AOCI to earnings:    
Other [1] (1,225) (703)
Tax effect 306 175
Net of tax amount (9,726) 9,780
Other reclassifications 0 (211)
Balance, end of period (28,651) (18,925)
Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 121,957 126,146
Unrecognized gains (losses) arising in AOCI during the period:    
Gross 42,316 14,225
Tax effect 369 446
Reclassifications from AOCI to earnings:    
Gross [2] (22,321) (19,354)
Tax effect 471 449
Net of tax amount 20,835 (4,234)
Other reclassifications 0 45
Balance, end of period 142,792 121,957
'Accumulated Other Comprehensive Income [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 103,032 97,652
Reclassifications from AOCI to earnings:    
Balance, end of period $ 114,141 $ 103,032
[1] Included in the computation of net periodic pension costs.
[2] Included in Interest expense, net on the Consolidated Statements of Operations.