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Components of Accumulated Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance, beginning of period $ 1,526,133 $ 1,304,953 $ 1,226,831
Effect of pension settlement 10,553 0 31,811
Balance, end of period 2,263,153 1,526,133 1,304,953
Pension Plans [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance, beginning of period (49,579) (79,025)  
Net gain arising during the period 1,857 19,147  
Effect of pension settlement 10,553 0  
Amounts reclassified from AOCI to earnings 4,077 10,299  
Balance, end of period (33,092) (49,579) (79,025)
Other Postretirement Benefit Plans [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance, beginning of period (1,790) (14,783)  
Net gain arising during the period 6,208 12,378  
Amounts reclassified from AOCI to earnings 180 615  
Balance, end of period 4,598 (1,790) (14,783)
Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance, beginning of period 8,131 (27,181)  
Net gain arising during the period 116,774 26,206  
Amounts reclassified from AOCI to earnings 1,241 9,106  
Balance, end of period 126,146 8,131 (27,181)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance, beginning of period (43,238) (120,989) (147,359)
Balance, end of period $ 97,652 $ (43,238) $ (120,989)