Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Statements of Income Data

The following tables set forth selected quarterly statements of income data for the periods indicated:

	Quarter Ended
	March 31, 2019		June 30, 2019		September 30, 2019		December 31, 2019
Revenues	$	199,943	$	169,313	$	175,006	$	193,409
Operating income	$	62,488	$	52,886	$	50,556	$	60,294
Net income	$	47,282	$	48,762	$	39,152	$	45,380
Earnings per share, basic	$	0.82	$	0.85	$	0.68	$	0.79
Earnings per share, diluted	$	0.81	$	0.83	$	0.67	$	0.78
Weighted average shares outstanding:
Basic		57,357		57,569		57,654		57,659
Diluted		58,316		58,410		58,383		58,378

	Quarter Ended
	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018
Revenues	$	153,916	$	128,800	$	133,288	$	150,332
Operating income	$	51,020	$	43,037	$	36,245	$	43,413
Net income	$	41,160	$	35,722	$	28,769	$	31,414
Earnings per share, basic	$	0.71	$	0.62	$	0.50	$	0.55
Earnings per share, diluted	$	0.70	$	0.61	$	0.49	$	0.54
Weighted average shares outstanding:
Basic		57,793		57,837		57,727		57,491
Diluted		58,739		58,721		58,545		58,238