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Impairment fair value, ceiling test and transaction costs (Details 3) - Discontinued operations, held-for-sale or disposed of by sale [Member] - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Refining [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Fair value impairment $ 251,900,000              
Fair value impairment after tax 156,700,000              
Exploration and production [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Fair value impairment 900,000 $ (1,400,000)   $ 400,000,000       $ 754,500,000
Fair value impairment after tax 600,000 (900,000)   $ 252,000,000       475,400,000
Disposal group transactions costs   $ 300,000           $ 2,500,000
Expensed exit and disposal costs 3,800,000         $ 5,600,000 $ 10,500,000  
Estimated exit and disposal costs 300,000         300,000 300,000  
Exit lease payments 400,000         900,000    
Loss on contract termination 3,200,000   $ 3,300,000          
Impairment of oil and gas properties         $ 500,400,000      
Impairment of oil and gas properties, after tax         $ 315,300,000      
Federal and State Taxing Authority [Member] | Refining [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Operating Loss Carryforwards $ 137,600,000         $ 137,600,000 $ 137,600,000