Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues
Total operating revenues	$ 1,108,595	$ 1,065,575	$ 901,123
Operating expenses
Sales and marketing expenses	386,840	326,333	280,561
Compensation and benefits expenses	198,412	221,627	194,654
Processing expenses	200,674	181,160	161,011
Other general and administrative expenses	199,751	206,040	155,601
Total operating expenses	985,677	935,160	791,827
Operating income	122,918	130,415	109,296
Interest expense, net	1,837	6,598	5,838
Income before income taxes	121,081	123,817	103,458
Income tax expense	21,184	5,114	17,571
Net income	$ 99,897	$ 118,703	$ 85,887
Earnings per common share
Basic earnings per common share (in USD per share)	$ 1.91	$ 2.27	$ 1.70
Diluted earnings per common share (in USD per share)	$ 1.88	$ 2.18	$ 1.61
Weighted-average common shares issued and outstanding
Basic (in shares)	52,195	52,222	50,482
Diluted (in shares)	53,138	54,481	53,198
Card revenues and other fees
Operating revenues
Operating revenues	$ 459,357	$ 482,881	$ 414,775
Processing and settlement service revenues
Operating revenues
Operating revenues	287,064	247,958	217,454
Interchange revenues
Operating revenues
Operating revenues	330,233	310,919	257,922
Interest income, net
Operating revenues
Operating revenues	$ 31,941	$ 23,817	$ 10,972