Number of Leased Retail Gasoline, Convenience Store Facilities

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Number of Retail Gasoline, Convenience Store Facilities

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Acquisitions - Additional Information (Details)		3 Months Ended		6 Months Ended
Acquisitions - Additional Information (Details)	Mar. 23, 2018 USD ($) gasoline_store_facility	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 150,849,000		$ 150,849,000		$ 107,187,000
Acquisition related costs		749,000	$ 0	1,381,000	$ 253,000
Northwest Retail Acquisition
Business Acquisition [Line Items]
Number of retail gasoline, convenience store facilities \| gasoline_store_facility	21
Number of leased retail gasoline, convenience store facilities \| gasoline_store_facility	12
Consideration transferred	$ 75,000,000
Goodwill	$ 43,662,000
Acquisition related costs		$ 0		$ 600,000
Trade Names \| Northwest Retail Acquisition
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life				3 years