Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Income [Abstract]
Revenues, net	$ 519,591	$ 433,841	$ 354,073
Expenses:
Merchant commissions	51,199	49,050	39,709
Processing	84,516	69,687	57,997
Selling	36,606	32,731	30,579
General and administrative	84,765	78,135	51,375
Depreciation and amortization	36,171	33,745	28,368
Operating income	226,334	170,493	146,045
Other income, net	(589)	(1,319)	(933)
Interest expense, net	13,377	20,532	17,363
Loss on early extinguishment of debt	2,669
Total other expense	15,457	19,213	16,430
Income before income taxes	210,877	151,280	129,615
Provision for income taxes	63,542	43,384	40,563
Net income	147,335	107,896	89,052
Calculation of income attributable to common shareholders:
Convertible preferred stock accrued dividends		(1,488)	(15,789)
Income attributable to common shareholders for basic earnings per share	$ 147,335	$ 106,408	$ 73,263
Earnings per share:
Basic earnings per share	$ 1.83	$ 3.00	$ 2.17
Diluted earnings per share	$ 1.76	$ 1.34	$ 1.13
Weighted average shares outstanding:
Basic weighted average shares outstanding	80,610	35,434	33,802
Diluted weighted average shares outstanding	83,654	80,751	78,854