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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.