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Significant Retailer Concentrations (Details) - Customer concentration risk - Walmart	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Percent of total operating revenues
Concentration Risk [Line Items]
Concentration risk, percentage	35.00%	37.00%	33.00%	35.00%
Settlement assets
Concentration Risk [Line Items]
Concentration risk, percentage			13.00%		18.00%

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