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Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]


	Quarter Ended
	March 31		June 30		September 30		December 31
2020
Revenues	$	604,593	$	607,852	$	622,249	$	626,581







Operating income	$	73,056	$	65,599	$	73,070	$	70,938






Net income	$	56,747	$	48,174	$	50,172	$	55,589
Earnings per common share — basic (1)	$	1.56	$	1.33	$	1.41	$	1.63
Earnings per common share — diluted (1)	$	1.49	$	1.27	$	1.35	$	1.57
Weighted average common shares outstanding
Basic	36,415		36,169		35,639		34,198
Diluted	38,190		37,852		37,086		35,484


	Quarter Ended
	March 31		June 30		September 30		December 31
2019
Revenues	$	551,274	$	606,119	$	593,106	$	602,218







Operating income	$	87,162	$	88,095	$	82,138	$	48,200




Net income	$	62,645	$	64,598	$	60,422	$	29,061
Earnings per common share — basic (1)	$	1.69	$	1.75	$	1.65	$	0.80
Earnings per common share — diluted (1)	$	1.64	$	1.69	$	1.59	$	0.76
Weighted average common shares outstanding
Basic	36,981		36,960		36,617		36,545
Diluted	38,219		38,168		37,938		38,126

(1)The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted average number of common shares outstanding during each quarterly period.