CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating revenues:
Total operating revenues	$ 316,240	$ 278,326	$ 678,409	$ 618,840
Operating expenses:
Sales and marketing expenses	106,811	87,432	223,549	186,133
Compensation and benefits expenses	58,867	48,298	111,932	109,773
Processing expenses	71,371	49,222	142,466	100,854
Other general and administrative expenses	73,801	49,411	136,223	96,732
Total operating expenses	310,850	234,363	614,170	493,492
Operating income	5,390	43,963	64,239	125,348
Interest expense, net	443	66	684	1,670
Other income (expense), net	2,154	(99)	2,346	34
Income before income taxes	7,101	43,798	65,901	123,712
Income tax expense	3,807	9,106	15,762	24,977
Net income	$ 3,294	$ 34,692	$ 50,139	$ 98,735
Basic earnings per common share (in usd per share)	$ 0.06	$ 0.66	$ 0.95	$ 1.87
Diluted earnings per common share (in usd per share)	$ 0.06	$ 0.64	$ 0.93	$ 1.82
Basic weighted-average common shares issued and outstanding (in shares)	52,275	52,588	52,084	52,818
Diluted weighted-average common shares issued and outstanding (in shares)	53,164	53,811	52,913	54,154
Card revenues and other fees
Operating revenues	$ 152,681	$ 121,613	$ 294,075	$ 251,190
Processing and settlement service revenues
Operating revenues	65,450	67,073	188,516	174,652
Interchange revenues
Operating revenues	95,970	81,334	186,836	173,875
Interest income, net
Operating revenues	$ 2,139	$ 8,306	$ 8,982	$ 19,123