Basis of Presentation and Principles of Consolidation (Details) (Customer Concentration Risk [Member])			3 Months Ended	6 Months Ended
Jun. 30, 2013 customers	Dec. 31, 2012 customers	Jun. 30, 2013 Couche-Tard [Member] Net sales [Member]	Jun. 30, 2012 Couche-Tard [Member] Net sales [Member]	Jun. 30, 2013 Couche-Tard [Member] Net sales [Member]	Jun. 30, 2012 Couche-Tard [Member] Net sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			13.00%	13.00%	13.00%	13.00%
Customers accounted for 10% or more of accounts receivable, number	0	0

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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