Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues, net	$ 608,623	$ 661,093
Expenses:
Processing	116,428	233,703
Selling	52,082	55,859
General and administrative	108,362	106,110
Depreciation and amortization	65,729	64,476
Other operating, net	57	(38)
Operating income	265,965	200,983
Investment (gain) loss	(9)	2,371
Other expense (income), net	1,743	(9,366)
Interest expense, net	28,551	35,679
Total other expense	30,285	28,684
Income before income taxes	235,680	172,299
Provision for income taxes	51,441	25,239
Net income	$ 184,239	$ 147,060
Earnings per share:
Basic earnings per share (in dollars per share)	$ 2.21	$ 1.73
Diluted earnings per share (in dollars per share)	$ 2.15	$ 1.67
Weighted average shares outstanding:
Basic (in shares)	83,475	84,902
Diluted (in shares)	85,764	88,205