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Reconciliation of income and expenses (Details 8) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss from discontinued operations [1] $ (2,198,000) $ (5,400,000) $ (3,702,000) $ (299,538,000)
Loss from discontinued operations attributable to noncontrolling interest 0 0 0 (131,691,000)
Discontinued operations, held-for-sale or disposed of by sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues 121,000 162,000 356,000 122,894,000
Operating expenses 384,000 230,000 (4,988,000) 513,756,000
Operating income (loss) (263,000) (68,000) 5,344,000 (390,862,000)
Other income 0 375,000   762,000
Other expense     (13,000)  
Interest expense 0 0 239,000 1,753,000
Income (loss) from discontinued operations before income taxes (263,000) 307,000 5,092,000 (391,853,000)
Income taxes 1,935,000 5,707,000 8,794,000 (92,315,000)
Loss from discontinued operations (2,198,000) (5,400,000) (3,702,000) (299,538,000)
Loss from discontinued operations attributable to noncontrolling interest 0 0 0 (131,691,000)
Loss from discontinued operations attributable to the Company (2,198,000) (5,400,000) (3,702,000) (167,847,000)
Discontinued operations, held-for-sale or disposed of by sale [Member] | Refining [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pretax income (loss) attributable to the Company $ 0 $ 935,000 $ 6,900,000 $ (253,000,000.0)
[1] Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.