Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues, net	$ 253,908	$ 193,651
Expenses:
Merchant commissions	17,623	13,861
Processing	36,856	29,943
Selling	17,414	11,704
General and administrative	43,461	29,261
Depreciation and amortization	24,418	14,629
Operating income	114,136	94,253
Other expense, net	544	292
Interest expense, net	5,461	3,448
Total other expense	6,005	3,740
Income before income taxes	108,131	90,513
Provision for income taxes	33,022	25,851
Net income	$ 75,109	$ 64,662
Earnings per share:
Basic earnings per share	$ 0.91	$ 0.80
Diluted earnings per share	$ 0.88	$ 0.77
Weighted average shares outstanding:
Basic weighted average shares outstanding	82,737	81,222
Diluted weighted average shares outstanding	85,695	83,960