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Acquisitions - Additional Information (Details) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 23, 2018 USD ($) gasoline_store_facility | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 152,884 | $ 107,187
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 |  |
Goodwill | $ 45,683 |  |
Integration and acquisition related costs |  | $ 600 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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