Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenues, net	$ 273,502	$ 220,869	$ 527,410	$ 414,520
Expenses:
Merchant commissions	20,327	19,555	37,950	33,416
Processing	38,845	32,010	75,701	61,953
Selling	17,521	13,386	34,935	25,090
General and administrative	37,896	30,954	81,357	60,215
Depreciation and amortization	24,429	15,890	48,847	30,519
Operating income	134,484	109,074	248,620	203,327
Equity method investment loss	1,489		1,489
Other (income) expense, net	(268)	(6)	276	286
Interest expense, net	5,308	3,756	10,769	7,204
Total other expense	6,529	3,750	12,534	7,490
Income before taxes	127,955	105,324	236,086	195,837
Provision for income taxes	39,406	32,225	72,428	58,076
Net income	$ 88,549	$ 73,099	$ 163,658	$ 137,761
Earnings per share:
Basic earnings per share	$ 1.07	$ 0.90	$ 1.97	$ 1.69
Diluted earnings per share	$ 1.03	$ 0.87	$ 1.91	$ 1.64
Weighted average shares outstanding:
Basic weighted average shares outstanding	82,996	81,573	82,867	81,398
Diluted weighted average shares outstanding	85,817	84,461	85,757	84,212