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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
During the nine months ended September 30, 2016, the change in the carrying amount of goodwill was as follows (in thousands):
Balance at beginning of period
$
41,327

Acquisition of Wyoming Refining Company (1)
63,266

Mid Pac acquisition purchase price allocation adjustments (1)
(589
)
Balance at end of period
$
104,004

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(1)Please read Note 4—Acquisitions for further information.