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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2024
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information Amounts presented are in thousands, except per share data:
Three Months Ended December 31,
20242023
Operating revenues$373,466 $356,009 
Operating income91,696 103,163 
Net income$80,552 $83,142 
Average common shares outstanding61,315 61,244 
Income per average common share: 
Basic$1.32 $1.37 
Diluted$1.31 $1.37