UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
UNAUDITED QUARTERLY FINANCIAL INFORMATION [Abstract]
Revenues	$ 102,451	$ 102,057	$ 97,031	$ 101,158	$ 111,767	$ 118,985	$ 122,665	$ 138,404	$ 402,697	$ 491,821	$ 604,762
Income (loss) from continuing operations	(8,953)	1,086	(13,838)	(2,176)	7,289	(1,334)	5,001	10,159	(23,881)	21,115	65,687
Loss from discontinued operations	(2,986)	(2,570)	(6,870)	(879)	(1,110)	(2,592)	(71)	198	(13,305)	(3,575)	4,044
Net income (loss)	$ (11,939)	$ (1,484)	$ (20,708)	$ (3,055)	$ 6,179	$ (3,926)	$ 4,930	$ 10,357	$ (37,186)	$ 17,540	$ 69,731
Basic [Abstract]
(Loss) earnings per share from continuing operations (in dollars per share)	$ (0.4)	$ 0.05	$ (0.62)	$ (0.1)	$ 0.33	$ (0.06)	$ 0.23	$ 0.46	$ (1.08)	$ 0.96	$ 2.69
(Loss) earnings per share from discontinued operations (in dollars per share)	$ (0.14)	$ (0.12)	$ (0.31)	$ (0.04)	$ (0.05)	$ (0.12)	$ (0.01)	$ 0.01	$ (0.6)	$ (0.16)	$ 0.17
Net income (loss) per share (in dollars per share)	$ (0.54)	$ (0.07)	$ (0.93)	$ (0.14)	$ 0.28	$ (0.18)	$ 0.22	$ 0.47	$ (1.68)	$ 0.80	$ 2.86
Diluted [Abstract]
(Loss) earnings per share from continuing operations (in dollars per share)	$ (0.4)	$ 0.05	$ (0.62)	$ (0.1)	$ 0.33	$ (0.06)	$ 0.22	$ 0.45	$ (1.08)	$ 0.95	$ 2.63
(Loss) earnings per share from discontinued operations (in dollars per share)	$ (0.14)	$ (0.12)	$ (0.31)	$ (0.04)	$ (0.05)	$ (0.12)	$ 0	$ 0.01	$ (0.6)	$ (0.16)	$ 0.16
Net income (loss) per share (in dollars per share)	$ (0.54)	$ (0.07)	$ (0.93)	$ (0.14)	$ 0.28	$ (0.18)	$ 0.22	$ 0.46	$ (1.68)	$ 0.79	$ 2.79