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Components of Accumulated Other Comprehensive Income (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period $ 2,037,670 $ 2,171,098
Reclassifications from AOCI to earnings:    
Balance, end of period 2,009,893 2,153,272
Pension and Other Postretirement Employee Benefits [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period (28,651) (18,925)
Reclassifications from AOCI to earnings:    
Other [1] (197) (306)
Tax effect 49 77
Net of tax amount (148) (229)
Balance, end of period (28,799) (19,154)
Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 142,792 121,957
Unrecognized gains (losses) arising in AOCI during the period:    
Gross (12,188) 21,872
Tax effect 84 (352)
Reclassifications from AOCI to earnings:    
Gross [2] (4,587) (5,719)
Tax effect 82 124
Net of tax amount (16,609) 15,925
Balance, end of period 126,183 137,882
Accumulated Other Comprehensive Income [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 114,141 103,032
Reclassifications from AOCI to earnings:    
Balance, end of period $ 97,384 $ 118,728
[1] Included in the computation of net periodic pension costs.
[2] Included in Interest expense, net on the Condensed Consolidated Statement of Operations.