Annual report pursuant to Section 13 and 15(d)

Acquisitions And Dispositions (Pro Forma Results) (Details)

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Acquisitions And Dispositions (Pro Forma Results) (Details) - Sojitz [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Oil and 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)