Acquisitions (Narrative) (Details)						12 Months Ended		12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Allstar Business Solutions Limited [Member] USD ($)	Dec. 31, 2011 Allstar Business Solutions Limited [Member] GBP (£)	Dec. 31, 2011 Mexican Prepaid FuelCard And Food Voucher Business [Member] USD ($)	Dec. 31, 2010 Mexican Prepaid FuelCard And Food Voucher Business [Member] USD ($)	Dec. 31, 2009 CLC Group Inc And Subsidiaries [Member] USD ($)	Dec. 31, 2009 ReD Fuel Cards (Europe) Limited [Member] USD ($)
Business Acquisition [Line Items]
Aggregate purchase price	$ 333,800,000	$ 11,200,000		$ 312,000,000	£ 200,000,000			$ 169,100,000
Goodwill		11,330,000		172,898,000					182,899,000
Number of businesses served over by acquired entity						10,000
Number of card holders and beneficiaries hold by businesses						800,000
Purchase price allocation, cash and cash equivalents		1,900,000	3,000,000
Deferred tax liabilities			39,200,000	20,500,000			1,500,000
Goodwill deductible tax amount						237,000,000
Acquisition related costs						2,300,000
Business acquisition, date								April 1, 2009	August 13, 2009
Business acquisition, cash consideration paid								161,100,000	62,900,000
Issuance of Series E Preferred Stock as consideration for acquisition								$ 8,000,000