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Selected Quarterly Financial Information (Summary of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues-oil and natural gas sales | $ 27,606 | $ 25,266 | $ 24,426 | $ 27,645 | $ 17,156 | $ 18,178 | $ 20,425 | $ 21,266 | $ 104,943 | $ 77,025 | $ 59,784
Total operating costs and expenses | 12,433 | 7,940 | 19,017 | 14,631 | 14,413 | 14,454 | 15,068 | 13,055 | 54,021 | 56,990 | 63,909
Operating income (loss) | 15,206 | 17,320 | 5,723 | 13,038 | 2,495 | 3,721 | 5,587 | 8,148 | 51,287 | 19,951 | (4,391)
Income (loss) from continuing operations | 10,504 | 78,626 | 887 | 8,711 | 3,534 | (148) | 2,451 | 4,435 | 98,728 | 10,272 | (18,267)
Loss from discontinued operations | (80) | (21) | (343) | (52) | (103) | (174) | (168) | (176) | (496) | (621) | (8,283)
Net income (loss) | $ 10,424 | $ 78,605 | $ 544 | $ 8,659 | $ 3,431 | $ (322) | $ 2,283 | $ 4,259 | $ 98,232 | $ 9,651 | $ (26,550)
Basic net income (loss) per share | $ 0.17 | $ 1.31 | $ 0.02 | $ 0.15 | $ 0.060 | $ 0.000 | $ 0.040 | $ 0.070 | $ 1.64 | $ 0.16 | $ (0.45)
Diluted net income (loss) per share | 0.17 | 1.28 | 0.02 | 0.15 | 0.060 | 0.000 | 0.040 | 0.070 | 1.62 | 0.16 | (0.45)
Basic income (loss) from continuing operations per share | 0.17 | 1.31 | 0.02 | 0.15 | 0.06 | 0.00 | 0.04 | 0.07 | 1.65 | 0.17 | (0.31)
Diluted income (loss) from continuing operations per share | $ 0.17 | $ 1.28 | $ 0.02 | $ 0.15 | $ 0.06 | $ 0.00 | $ 0.04 | $ 0.07 | $ 1.63 | $ 0.17 | $ (0.31)

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