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QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas sales |  | $ 1,710 |  | $ 2,622 |  | $ 3,285 |  | $ 2,679 |  | $ 5,067 |  | $ 9,928 |  | $ 9,128 |  | $ 8,256 |  | $ 9,047 | $ 28,331 | $ 31,214
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties |  | (13,782) |  | (21,446) |  | (3,208) |  | (19,240) |  |  |  |  |  |  |  |  |  | 57,676 |  | 5,828
Other | [1] | (4,710) |  | (5,534) |  | (5,266) |  | (6,174) |  | $ (7,599) |  | $ (9,648) |  | $ (7,671) |  | $ (6,841) |  |  |  |
Operating income (loss) |  | (16,782) | [1] | (24,358) | [1] | (5,189) | [1] | (22,735) | [1] | (2,532) | [1] | 280 | [1] | 1,457 | [1] | 1,415 | [1] | (69,064) | $ 620 | (1,675)
Income (loss) from continuing operations |  | (16,038) | [1] | (22,785) | [1] | (5,542) | [1] | (22,919) | [1] | (1,663) | [1] | 898 | [1] | 744 | [1] | 1,038 | [1] | (67,284) | 1,017 | (4,515)
Discontinued operations |  | (23,224) |  | (866) |  | (738) |  | (784) |  | (671) |  | (961) |  | (688) |  | (788) |  | (25,612) | (3,108) | (2,864)
Net income (loss) |  | $ (39,262) |  | $ (23,651) |  | $ (6,280) |  | $ (23,703) |  | $ (2,334) |  | $ (63) |  | $ 56 |  | $ 250 |  | $ (92,896) | $ (2,091) | $ (7,379)
Income (loss) per share - basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | $ (0.57) | [1],[2] | $ (0.81) | [1],[2] | $ (0.20) | [1],[2] | $ (0.82) | [1],[2] | $ (0.06) | [1],[2] | $ 0.03 | [1],[2] | $ 0.03 | [1],[2] | $ 0.04 | [1],[2] | $ (2.40) | $ 0.04 | $ (0.16)
Discontinued operations (in dollars per share) |  | (0.83) | [1],[2] | (0.03) | [1],[2] | (0.03) | [1],[2] | (0.03) | [1],[2] | (0.02) | [1],[2] | $ (0.03) | [1],[2] | $ (0.03) | [1],[2] | (0.03) | [1],[2] | (0.91) | (0.12) | (0.11)
Total (in dollars per share) |  | (1.40) | [1],[2] | (0.84) | [1],[2] | (0.22) | [1],[2] | (0.85) | [1],[2] | (0.08) | [1],[2] |  | [1],[2] |  | [1],[2] | 0.01 | [1],[2] | (3.31) | (0.08) | (0.27)
Income (loss) per share - diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | (0.57) | [1],[2] | (0.81) | [1],[2] | (0.20) | [1],[2] | (0.82) | [1],[2] | (0.06) | [1],[2] | $ 0.03 | [1],[2] | $ 0.03 | [1],[2] | 0.04 | [1],[2] | (2.40) | 0.04 | (0.16)
Discontinued operations (in dollars per share) |  | (0.83) | [1],[2] | (0.03) | [1],[2] | (0.02) | [1],[2] | (0.03) | [1],[2] | (0.02) | [1],[2] | $ (0.03) | [1],[2] | $ (0.03) | [1],[2] | (0.03) | [1],[2] | (0.91) | (0.11) | (0.11)
Total (in dollars per share) |  | $ (1.40) | [1],[2] | $ (0.84) | [1],[2] | $ (0.22) | [1],[2] | $ (0.85) | [1],[2] | $ (0.08) | [1],[2] |  | [1],[2] |  | [1],[2] | $ 0.01 | [1],[2] | $ (3.31) | $ (0.07) | $ (0.27)
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  | 28,111,000 |  | 28,051,000 |  | 28,048,000 |  | 28,048,000 |  | 27,906,000 |  | 27,906,000 |  | 27,785,000 |  | 27,738,000 |  | 28,065,000 | 27,833,000 | 27,679,000
Diluted (in shares) |  | 28,111,000 | [1] | 28,051,000 | [1] | 28,048,000 | [1] | 28,048,000 | [1] | 27,906,000 | [1] | 28,359,000 | [1] | 28,238,000 | [1] | 28,142,000 | [1] | 28,065,000 | 28,099,000 | 27,679,000
[1] | Amounts have been restated from amounts reported in previous reports to retroactively present the impact of Discontinued Operations as discuss further in Note 6.
[2] | Earnings per share amounts may not sum due to rounding.

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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