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Significant Customer Concentrations Significant Customer Concentrations (Details) (Customer Concentration Risk [Member])
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Total Operating Revenues [Member] | Walmart [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 67.00% 64.00%
Total Operating Revenues [Member] | Three Other Largest Retailer Distributors, as a Group [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 21.00% 20.00%
Total Operating Revenues, Excluding Stock-Based Retailer Incentive Compensation [Member] | Walmart [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 67.00% 65.00%
Total Operating Revenues, Excluding Stock-Based Retailer Incentive Compensation [Member] | Three Other Largest Retailer Distributors, as a Group [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 21.00% 20.00%
GPR Cards Activated (in units) [Member] | Four Largest Retailers Distributors [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 85.00% 89.00%
Sales of Cash Transfer Products (in units) [Member] | Four Largest Retailers Distributors [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 88.00% 90.00%
Settlement Assets [Member] | Walmart [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 26.00% 34.00%
Settlement Assets [Member] | Three Other Largest Retailer Distributors, as a Group [Member]
   
Concentration Risk [Line Items]    
Concentration risk, percentage 28.00% 36.00%