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Acquisitions - Pro Forma Financial Information (Details) - Wyoming Refining Company
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues | $ $ 940,938
Net loss | $ $ (38,542)
Loss per share  
Basic (in dollars per shares) | $ / shares $ (0.85)
Diluted (in dollars per shares) | $ / shares $ (0.85)