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Significant Retailer Concentrations (Details) - Customer concentration risk - Walmart	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Percent of total operating revenues
Concentration Risk [Line Items]
Concentration risk, percentage	38.00%	41.00%	36.00%	39.00%
Settlement assets
Concentration Risk [Line Items]
Concentration risk, percentage			21.00%		33.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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