OIL AND GAS INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended			84 Months Ended	120 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015
OIL AND GAS INFORMATION
Property acquisition-unproved		$ 184,410
Property acquisition-proved	$ 18,626	172,264
Exploration costs	3	32
Development costs	17,359	108,676
Total costs related to oil and gas activities	35,988	465,382
Increase in asset retirement cost	8,700	2,100
Aggregate capitalized costs
Unproved oil and gas properties	14,658	204,627			$ 14,658
Proved oil and gas properties	1,125,297	1,091,063			1,125,297
Gross capitalized costs	1,139,955	1,295,690			1,139,955
Less accumulated depreciation, depletion, amortization and impairment expense	977,270	542,194			977,270
Total aggregate capitalized costs relating to oil and gas activities	162,685	753,496			162,685
Results of operations from oil and natural gas producing activities
Revenues	83,734	145,385
Production costs	(49,557)	(48,357)
Accretion of asset retirement obligation	(2,857)	(2,521)
Impairment	(562,151)
Depreciation, depletion, amortization	(59,729)	(50,686)
Income (loss) from oil and gas producing activities	(590,560)	43,821
Oil and gas properties not subject to amortization
Development costs	365	1,127	$ 126	$ 13,040	14,658
Total oil and gas properties not subject to amortization	$ 365	$ 1,127	$ 126	$ 13,040	$ 14,658
Minimum
Development costs
Expected drilling period of wells	5 years
Maximum
Development costs
Expected drilling period of wells	8 years