Basis of Presentation and Principles of Consolidation - Concentration of Credit Risks (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	May 25, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016 customer	Sep. 30, 2015	Dec. 31, 2015 customer
Concentration Risk [Line Items]
Stock split	2
Customer Concentration Risk | Sales | Couche-Tard and Murphy USA
Concentration Risk [Line Items]
Number of customers				2
Major customer percentage of net sales		23.20%		23.30%
Customer Concentration Risk | Sales | Couche-Tard
Concentration Risk [Line Items]
Major customer percentage of net sales			13.80%		14.30%
Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Major customer, number				0		0