Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues, net	$ 861,278	$ 667,381	$ 1,650,519	$ 1,276,004
Expenses:
Processing	185,588	122,294	359,782	238,722
Selling	79,324	63,225	156,213	115,307
General and administrative	147,446	115,008	290,968	223,370
Depreciation and amortization	78,474	69,218	155,276	134,947
Other operating, net	(34)	24	79	81
Operating income	370,480	297,612	688,201	563,577
Investment loss (gain)	193	0	345	(9)
Other expense, net	3,564	408	4,433	2,151
Interest expense, net	23,070	34,685	45,100	63,236
Total other expense	26,827	35,093	49,878	65,378
Income before income taxes	343,653	262,519	638,323	498,199
Provision for income taxes	81,482	66,272	158,200	117,713
Net income	$ 262,171	$ 196,247	$ 480,123	$ 380,486
Earnings per share:
Basic earnings per share (in dollars per share)	$ 3.42	$ 2.36	$ 6.22	$ 4.57
Diluted earnings per share (in dollars per share)	$ 3.35	$ 2.30	$ 6.10	$ 4.45
Weighted average shares outstanding:
Basic (in shares)	76,769	83,141	77,250	83,307
Diluted (in shares)	78,239	85,295	78,762	85,528