Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues, net	$ 1,199,390	$ 895,171	$ 707,534
Expenses:
Merchant commissions	96,254	68,143	58,573
Processing	173,337	134,030	115,446
Selling	75,527	57,346	46,429
General and administrative	205,963	142,283	110,122
Depreciation and amortization	112,361	72,737	52,036
Other operating, net	(29,501)
Operating income	565,449	420,632	324,928
Other (income) expense, net	(700)	602	1,121
Equity method investment loss	8,586
Interest expense, net	28,856	16,461	13,017
Loss on early extinguishment of debt	15,764
Total other expense	52,506	17,063	14,138
Income before income taxes	512,943	403,569	310,790
Provision for income taxes	144,236	119,068	94,591
Net income	$ 368,707	$ 284,501	$ 216,199
Earnings per share:
Basic earnings per share	$ 4.37	$ 3.48	$ 2.59
Diluted earnings per share	$ 4.24	$ 3.36	$ 2.52
Weighted average shares outstanding:
Basic weighted average shares outstanding	84,317	81,793	83,328
Diluted weighted average shares outstanding	86,982	84,655	85,736