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Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues-oil and natural gas sales | $ 17,156 | $ 18,178 | $ 20,425 | $ 21,266 | $ 15,326 | $ 14,635 | $ 18,847 | $ 10,976 | $ 77,025 | $ 59,784 | $ 80,445
Total operating costs and expenses | 14,413 | 14,454 | 15,068 | 13,055 | 14,249 | 10,919 | 14,232 | 24,509 | 56,990 | 63,909 | 182,459
Operating income (loss) | 2,495 | 3,721 | 5,587 | 8,148 | 819 | 3,690 | 4,615 | (13,515) | 19,951 | (4,391) | (103,106)
Income (loss) from continuing operations | 3,534 | (148) | 2,451 | 4,435 | (3,355) | 1,016 | (498) | (15,430) | 10,272 | (18,267) | (120,554)
Loss from discontinued operations | (103) | (174) | (168) | (176) | (286) | (15,783) | (20) | 7,806 | (621) | (8,283) | (38,102)
Net income (loss) | $ 3,431 | $ (322) | $ 2,283 | $ 4,259 | $ (3,641) | $ (14,767) | $ (518) | $ (7,624) | $ 9,651 | $ (26,550) | $ (158,656)
Basic net income (loss) per share | $ 0.060 | $ (0.010) | $ 0.040 | $ 0.070 | $ (0.060) | $ (0.250) | $ (0.010) | $ (0.130) | $ 0.16 | $ (0.45) | $ (2.72)
Diluted net income (loss) per share | $ 0.060 | $ (0.010) | $ 0.040 | $ 0.070 | $ (0.060) | $ (0.250) | $ (0.010) | $ (0.130) | $ 0.16 | $ (0.45) | $ (2.72)

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