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Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Wyoming Refining Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 522,163 | $ 598,211 | $ 1,463,101 | $ 1,889,449
Net income (loss) | $ (26,384) | $ 22,651 | $ (64,926) | $ 36,915
Earnings (loss) per share |  |  |  |
Basic (in dollars per shares) | $ (0.58) | $ 0.58 | $ (1.43) | $ 0.99
Diluted (in dollars per shares) | $ (0.58) | $ 0.49 | $ (1.43) | $ 0.85
Mid Pac Petroleum, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues |  |  |  | $ 1,649,915
Net income (loss) |  |  |  | $ 10,069

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