CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating revenues:
Operating revenues	$ 335,886	$ 289,050	$ 1,089,916	$ 958,477
Interest income, net	3,613	2,020	12,442	11,002
Total operating revenues	339,499	291,070	1,102,358	969,479
Operating expenses:
Sales and marketing expenses	84,002	96,189	299,412	319,738
Compensation and benefits expenses	65,045	61,077	199,996	173,009
Processing expenses	95,731	74,158	287,716	216,624
Other general and administrative expenses	85,891	62,296	240,616	198,519
Total operating expenses	330,669	293,720	1,027,740	907,890
Operating income (loss)	8,830	(2,650)	74,618	61,589
Interest expense, net	38	39	113	723
Other income (expense), net	849	(1,650)	1,396	696
Income (loss) before income taxes	9,641	(4,339)	75,901	61,562
Income tax expense (benefit)	2,306	(1,347)	17,898	14,415
Net income (loss)	$ 7,335	$ (2,992)	$ 58,003	$ 47,147
Basic earnings (loss) per common share: (in usd per share)	$ 0.13	$ (0.06)	$ 1.06	$ 0.89
Diluted earnings (loss) per common share (in usd per share)	$ 0.13	$ (0.06)	$ 1.04	$ 0.87
Basic weighted-average common shares issued and outstanding (in shares)	54,221	52,635	53,961	52,269
Diluted weighted-average common shares issued and outstanding (in shares)	55,415	52,635	55,180	53,455
Card revenues and other fees
Operating revenues:
Operating revenues	$ 202,482	$ 146,648	$ 586,431	$ 440,723
Cash processing revenues
Operating revenues:
Operating revenues	47,516	57,526	205,256	246,042
Interchange revenues
Operating revenues:
Operating revenues	$ 85,888	$ 84,876	$ 298,229	$ 271,712