Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues, net	$ 585,283	$ 681,048	$ 1,771,522	$ 1,949,967
Expenses:
Processing	119,856	135,016	474,849	384,588
Selling	46,762	51,790	144,995	152,907
General and administrative	90,868	98,050	283,717	297,618
Depreciation and amortization	63,479	67,347	190,117	205,700
Other operating, net	(214)	(296)	(482)	(1,480)
Operating income	264,532	329,141	678,326	910,634
Investment loss (gain)	1,330	0	(30,008)	15,660
Other (income) expense, net	(3,591)	(120)	(10,477)	628
Interest expense, net	31,383	36,504	99,474	115,088
Total other expense	29,122	36,384	58,989	131,376
Income before income taxes	235,410	292,757	619,337	779,258
Provision for income taxes	46,593	66,952	124,972	119,695
Net income	$ 188,817	$ 225,805	$ 494,365	$ 659,563
Earnings per share:
Basic earnings per share (in dollars per share)	$ 2.26	$ 2.61	$ 5.87	$ 7.64
Diluted earnings per share (in dollars per share)	$ 2.19	$ 2.49	$ 5.68	$ 7.33
Weighted average shares outstanding:
Basic (in shares)	83,719	86,662	84,170	86,332
Diluted (in shares)	86,273	90,522	87,006	89,976