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Exploration and Production Activities (Unaudited) Results of operations (Details 4) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 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] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | $ 6,261 | $ (202,626) | $ (251,415) | $ (324,605) | $ 27,700 | $ 38,482 | $ 23,881 | $ 25,112 | $ (772,385) | $ 115,175 | $ 109,879
Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | $ (772,385) | $ 111,998 | $ 110,191

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