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Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2013 | Jan. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sales proceeds |  |  | $ 93,765 | $ 1,097 | $ 173,118
Discontinued Operations, Disposed of by Sale [Member] | Hankinson Renewable Energy, LLC [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sales proceeds | $ 170,000 |  |  |  |
Working capital adjustments | $ 3,118 | $ 1,100 |  |  |
After-tax gain (loss) from disposal of refineries |  |  |  | $ 781 | $ 52,542

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