Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2022

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Amounts presented are in thousands, except per share data:

	Three Months Ended December 31,
	2022		2021
Operating revenues	$	425,283	$	347,341
Operating income	83,228		79,990
Net income	$	66,743	$	51,336
Average common shares outstanding	58,345		53,293
Income per average common share:
Basic	$	1.16	$	0.96
Diluted	$	1.16	$	0.96