Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

(21)          Fourth Quarter Financial Data (Unaudited)

Our fourth quarter financial information has not been audited, but, in management's opinion, includes all adjustments necessary for a fair presentation. Amounts presented are in thousands, except per share data:

	Three Months Ended December 31,
	2021		2020
Operating revenues	$	347,341	$	313,445
Operating income	79,990		66,496
Net income	$	51,336	$	53,551
Average common shares outstanding	53,293		50,583
Income per average common share:
Basic	$	0.96	$	1.06
Diluted	$	0.96	$	1.06