CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating revenues:
Operating revenues	$ 1,414,410	$ 1,238,974	$ 1,076,654
Interest income, net	18,787	14,786	31,941
Total operating revenues	1,433,197	1,253,760	1,108,595
Operating expenses:
Sales and marketing expenses	382,163	415,111	386,840
Compensation and benefits expenses	264,686	233,155	198,412
Processing expenses	389,284	293,711	200,674
Other general and administrative expenses	330,590	281,710	199,751
Total operating expenses	1,366,723	1,223,687	985,677
Operating income	66,474	30,073	122,918
Interest expense, net	150	761	1,864
Other (expense) income, net	(2,624)	(1,217)	27
Income before income taxes	63,700	28,095	121,081
Income tax expense	16,220	4,964	21,184
Net income	$ 47,480	$ 23,131	$ 99,897
Basic earnings per common share (in USD per share)	$ 0.87	$ 0.43	$ 1.91
Diluted earnings per common share (in USD per share)	$ 0.85	$ 0.42	$ 1.88
Basic weighted-average common shares issued and outstanding (in shares)	54,070	52,438	52,195
Diluted weighted-average common shares issued and outstanding (in shares)	55,220	53,685	53,138
Card revenues and other fees
Operating revenues:
Operating revenues	$ 788,834	$ 593,915	$ 459,357
Cash processing revenues
Operating revenues:
Operating revenues	245,539	293,216	287,064
Interchange revenues
Operating revenues:
Operating revenues	$ 380,037	$ 351,843	$ 330,233