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Acquisitions And Dispositions (Pro Forma Results) (Details) - Sojitz [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |
Oil and natural gas sales | $ 65,427 | $ 88,940
Operating loss | (4,295) | (101,494)
Loss from continuing operations | $ (19,232) | $ (120,546)
Loss from continuing operations (per share) | $ (0.33) | $ (2.07)
Net loss (per share) | $ (0.47) | $ (2.72)

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