Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenues, net	$ 895,171	$ 707,534	$ 519,591
Expenses:
Merchant commissions	68,143	58,573	51,199
Processing	134,030	115,446	84,516
Selling	57,346	46,429	36,606
General and administrative	142,283	110,122	84,765
Depreciation and amortization	72,737	52,036	36,171
Operating income	420,632	324,928	226,334
Other expense (income), net	602	1,121	(589)
Interest expense, net	16,461	13,017	13,377
Loss on early extinguishment of debt			2,669
Total other expense	17,063	14,138	15,457
Income before income taxes	403,569	310,790	210,877
Provision for income taxes	119,068	94,591	63,542
Net income	$ 284,501	$ 216,199	$ 147,335
Earnings per share:
Basic earnings per share	$ 3.48	$ 2.59	$ 1.83
Diluted earnings per share	$ 3.36	$ 2.52	$ 1.76
Weighted average shares outstanding:
Basic weighted average shares outstanding	81,793	83,328	80,610
Diluted weighted average shares outstanding	84,655	85,736	83,654