Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Income [Abstract]
Revenues, net	$ 146,165	$ 111,005
Expenses:
Merchant commissions	10,393	8,277
Processing	25,579	17,932
Selling	10,175	7,787
General and administrative	23,823	17,915
Depreciation and amortization	11,720	8,607
Operating income	64,475	50,487
Other expense (income), net	588	(34)
Interest expense, net	3,563	3,363
Total other expense	4,151	3,329
Income before taxes	60,324	47,158
Provision for taxes	18,245	14,823
Net income	$ 42,079	$ 32,335
Earnings per share:
Basic earnings per share	$ 0.51	$ 0.40
Diluted earnings per share	$ 0.49	$ 0.39
Weighted average shares outstanding:
Basic weighted average shares outstanding	82,565	79,937
Diluted weighted average shares outstanding	85,164	83,378