Basis of Presentation and Principles of Consolidation (Details) (Customer Concentration Risk [Member])			3 Months Ended		9 Months Ended
	Sep. 30, 2013 customers	Dec. 31, 2012 customers	Sep. 30, 2013 Couche-Tard [Member] Net sales [Member]	Sep. 30, 2012 Couche-Tard [Member] Net sales [Member]	Sep. 30, 2013 Couche-Tard [Member] Net sales [Member]	Sep. 30, 2012 Couche-Tard [Member] Net sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			14.70%	13.70%	14.80%	13.60%
Customers accounted for 10% or more of accounts receivable, number	0	0