Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenues, net	$ 417,905	$ 404,605	$ 832,167	$ 820,771
Expenses:
Merchant commissions	22,308	21,725	50,541	49,051
Processing	80,691	74,564	160,505	155,920
Selling	31,947	27,297	58,500	53,628
General and administrative	63,586	63,388	131,180	133,110
Depreciation and amortization	48,436	48,827	84,764	96,909
Other operating, net	(231)	(347)	(446)	(772)
Operating income	171,168	169,151	347,123	332,925
Equity method investment (income) loss	(7,184)	5,118	(4,991)	7,818
Other expense, net	104	653	763	2,513
Interest expense, net	15,900	18,089	32,091	37,655
Total other expense	8,820	23,860	27,863	47,986
Income before income taxes	162,348	145,291	319,260	284,939
Provision for income taxes	48,163	46,613	95,103	92,108
Net income	$ 114,185	$ 98,678	$ 224,157	$ 192,831
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.23	$ 1.07	$ 2.42	$ 2.10
Diluted earnings per share (in dollars per share)	$ 1.21	$ 1.05	$ 2.37	$ 2.05
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	92,665	91,904	92,591	91,828
Diluted weighted average shares outstanding (in shares)	94,549	94,050	94,437	93,992