Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues, net	$ 484,426	$ 451,493	$ 1,316,593	$ 1,272,264
Expenses:
Merchant commissions	28,214	31,726	78,755	80,777
Processing	96,233	90,959	256,738	246,879
Selling	34,180	27,383	92,680	81,011
General and administrative	77,904	66,142	209,084	199,252
Depreciation and amortization	57,084	48,526	141,848	145,435
Other operating, net	(244)	(1,703)	(690)	(2,475)
Operating income	191,055	188,460	538,178	521,385
Equity method investment loss (income)	2,744	6,108	(2,247)	13,926
Other expense (income), net	293	(168)	1,056	2,345
Interest expense, net	17,814	17,163	49,905	54,818
Total other expense	20,851	23,103	48,714	71,089
Income before income taxes	170,204	165,357	489,464	450,296
Provision for income taxes	40,586	48,587	132,503	140,695
Net income	$ 129,618	$ 116,770	$ 356,961	$ 309,601
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.40	$ 1.27	$ 3.85	$ 3.37
Diluted earnings per share (in dollars per share)	$ 1.36	$ 1.24	$ 3.75	$ 3.29
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	92,631	92,110	92,604	91,923
Diluted weighted average shares outstanding (in shares)	95,307	94,157	95,204	94,069