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Subsequent Events (Details) $ in Millions		3 Months Ended
	Oct. 12, 2016 USD ($) location property	Mar. 31, 2017 USD ($)	Apr. 06, 2017 USD ($) store
Subsequent Event [Line Items]
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $		$ 33
Denny Oil Company [Member]
Subsequent Event [Line Items]
Business acquisition total purchase price | $	$ 55
Number of company-operated locations | location	6
Number of Dealer-Operated Locations | location	6
Number of fee properties | property	13
Store sales to 7-Eleven [Domain]
Subsequent Event [Line Items]
Number of stores | store			1,100
Business acquisition total purchase price | $			$ 3,300
Tennessee [Member] | West Texas Store Sale [Domain] [Domain]
Subsequent Event [Line Items]
Number of stores | store			42
Texas [Member] | West Texas Store Sale [Domain] [Domain]
Subsequent Event [Line Items]
Number of stores | store			208

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Business acquisition total purchase price

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Monetary value of the issuance of new units of limited partnership interest in a public offering, net of offering costs. This is a parenthetical disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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