Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	[1]	Sep. 30, 2019		Sep. 30, 2018	[1]
Income Statement [Abstract]
Revenues, net	$ 681,048	$ 619,586		$ 1,949,967		$ 1,790,070
Expenses:
Processing	135,016	128,400		384,588		356,086
Selling	51,790	44,806		152,907		135,926
General and administrative	98,050	98,058		297,618		284,858
Depreciation and amortization	67,347	67,267		205,700		207,379
Other operating, net	(296)	(35)		(1,480)		(140)
Operating income	329,141	281,090		910,634		805,961
Investment loss	0	7,147		15,660	[2]	7,147
Other (income) expense, net	(120)	303		628		465
Interest expense, net	36,504	36,072		115,088		100,287
Total other expense	36,384	43,522		131,376		107,899
Income before income taxes	292,757	237,568		779,258		698,062
Provision for income taxes	66,952	79,874		119,695		188,579
Net income	$ 225,805	$ 157,694		$ 659,563	[2]	$ 509,483
Earnings per share:
Basic earnings per share (in dollars per share)	$ 2.61	$ 1.78		$ 7.64		$ 5.72
Diluted earnings per share (in dollars per share)	$ 2.49	$ 1.71		$ 7.33		$ 5.50
Weighted average shares outstanding:
Basic (in shares)	86,662	88,456		86,332		89,126
Diluted (in shares)	90,522	92,081		89,976		92,671

[1] Reflects reclassifications from previously disclosed amounts to conform to current presentation.

[2] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using the modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 2.