Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues, net	$ 414,262	$ 416,166
Expenses:
Merchant commissions	28,233	27,326
Processing	79,814	81,356
Selling	26,553	26,331
General and administrative	67,594	69,722
Depreciation and amortization	36,328	48,082
Other operating, net	(215)	(425)
Operating income	175,955	163,774
Equity method investment loss	2,193	2,700
Other expense, net	659	1,860
Interest expense, net	16,191	19,566
Total other expense	19,043	24,126
Income before taxes	156,912	139,648
Provision for income taxes	46,940	45,495
Net income	$ 109,972	$ 94,153
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.19	$ 1.03
Diluted earnings per share (in dollars per share)	$ 1.17	$ 1.00
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	92,516	91,750
Diluted weighted average shares outstanding (in shares)	94,329	93,934