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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