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Acquisitions - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 23, 2018 USD ($) gasoline_store_facility | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 153,397,000 |  | $ 153,397,000 |  | $ 107,187,000
Acquisition related costs |  | 2,134,000 | $ 0 | 3,515,000 | $ 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 | $ 46,210,000 |  |  |  |  |
Initial accounting incomplete, adjustment, decrease to intangibles |  | 3,300,000 |  |  |  |
Initial accounting incomplete, adjustment, decrease to other noncurrent liabilities |  | 800,000 |  |  |  |
Initial accounting incomplete, adjustment, increase to goodwill |  | 2,500,000 |  |  |  |
Acquisition related costs |  | $ 0 |  | $ 600,000 |  |

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- Definition Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Liabilities + References No definition available. + Details
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- Definition Number of Leased Retail Gasoline, Convenience Store Facilities + References No definition available. + Details
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- Definition Number of Retail Gasoline, Convenience Store Facilities + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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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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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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