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 DATA (UNAUDITED)
Operating loss	$ (1,386)	$ (1,250)	$ (1,223)	$ (1,408)	$ (1,814)	$ (1,740)	$ (1,563)	$ (1,701)
Net income / (loss) from continuing operations	(771)	(850)	(830)	(625)	327	472	(2,447)	726	$ (3,076)	$ (918)	$ (4,439)
Net income/ (loss) from discontinued operations	(546,779)	45,010	5,526	9,042	18,293	31,123	29,108	30,490	(487,201)	109,010	156,779
Net income/ (loss)	$ (547,550)	$ 44,160	$ 4,696	$ 8,417	$ 18,620	$ 31,595	$ 26,661	$ 31,216	$ (490,277)	$ 108,092	$ 152,340
Net income/ (loss) per share-basic (in dollars per share)	$ (3.51)	$ 0.28	$ 0.03	$ 0.05	$ 0.13	$ 0.20	$ 0.17	$ 0.20	$ (3.14)	$ 0.69	$ 0.97
Net income/ (loss) per share-diluted (in dollars per share)	(3.51)	0.28	0.03	0.05	0.13	0.20	0.17	0.20	(3.14)	0.69	0.97
Net loss per share from continuing operations-basic (in dollars per share)	0.00	(0.01)	0.01	0.00	0.00	0.00	(0.01)	0.00	(0.02)	(0.01)	(0.03)
Net loss per share from continuing operations-diluted (in dollars per share)	0.00	(0.01)	(0.01)	0.00	0.00	0.00	(0.01)	0.00	(0.02)	(0.01)	(0.03)
Net income/ (loss) per share from discontinued operations-basic (in dollars per share)	(3.50)	0.29	(0.04)	0.05	0.13	0.20	0.18	0.20	(3.12)	0.70	1.00
Net income/ (loss) per share from discontinued operations-diluted (in dollars per share)	$ (3.50)	$ 0.29	$ 0.04	$ 0.05	$ 0.13	$ 0.20	$ 0.18	$ 0.20	$ (3.12)	$ 0.70	$ 1.00