Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues, net	$ 755,477	$ 585,283	$ 2,031,481	$ 1,771,522
Expenses:
Processing	149,564	119,856	388,286	474,849
Selling	71,204	46,762	186,511	144,995
General and administrative	121,785	90,868	345,155	283,717
Depreciation and amortization	74,237	63,479	209,184	190,117
Other operating, net	0	(214)	81	(482)
Operating income	338,687	264,532	902,264	678,326
Investment loss (gain)	0	1,330	(9)	(30,008)
Other expense (income), net	1,532	(3,591)	3,683	(10,477)
Interest expense, net	29,033	31,383	92,269	99,474
Total other expense	30,565	29,122	95,943	58,989
Income before income taxes	308,122	235,410	806,321	619,337
Provision for income taxes	74,115	46,593	191,828	124,972
Net income	$ 234,007	$ 188,817	$ 614,493	$ 494,365
Earnings per share:
Basic earnings per share (in dollars per share)	$ 2.86	$ 2.26	$ 7.42	$ 5.87
Diluted earnings per share (in dollars per share)	$ 2.80	$ 2.19	$ 7.24	$ 5.68
Weighted average shares outstanding:
Basic (in shares)	81,836	83,719	82,811	84,170
Diluted (in shares)	83,716	86,273	84,917	87,006