CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating revenues:
Total operating revenues	$ 362,169	$ 340,514
Operating expenses:
Sales and marketing expenses	116,738	98,701
Compensation and benefits expenses	53,065	61,475
Processing expenses	71,095	51,632
Other general and administrative expenses	62,422	47,321
Total operating expenses	303,320	259,129
Operating income	58,849	81,385
Interest expense, net	49	1,471
Income before income taxes	58,800	79,914
Income tax expense	11,955	15,871
Net income	$ 46,845	$ 64,043
Basic earnings per common share (in usd per share)	$ 0.89	$ 1.21
Diluted earnings per common share (in usd per share)	$ 0.87	$ 1.17
Basic weighted-average common shares issued and outstanding (in shares)	51,894	53,050
Diluted weighted-average common shares issued and outstanding (in shares)	52,673	54,551
Card revenues and other fees
Operating revenues	$ 141,394	$ 129,577
Processing and settlement service revenues
Operating revenues	123,066	107,579
Interchange revenues
Operating revenues	90,866	92,541
Interest income, net
Operating revenues	$ 6,843	$ 10,817