Significant Customer Concentrations Significant Customer Concentrations (Details) (Customer Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total Operating Revenues [Member] | Walmart [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	64.00%	64.00%	61.00%
Total Operating Revenues [Member] | Three Other Largest Retailer Distributors, as a Group [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	22.00%	20.00%	20.00%
Total Operating Revenues, Excluding Stock-Based Retailer Incentive Compensation [Member] | Walmart [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	65.00%	65.00%	62.00%
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%	19.00%
GPR Cards Activated (in units) [Member] | Four Largest Retailers Distributors [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	82.00%	87.00%	80.00%
Sales of Cash Transfer Products (in units) [Member] | Four Largest Retailers Distributors [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	87.00%	88.00%	90.00%
Settlement Assets [Member] | Walmart [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	34.00%	35.00%
Settlement Assets [Member] | Three Other Largest Retailer Distributors, as a Group [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	39.00%	38.00%