COMPUTATION OF EARNINGS (LOSS) PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Information related to EPS computation
Net income (loss) allocated to common shareholders (in dollars)	$ 10,431	$ 9,332	$ (7,708)	$ 10,266	$ 10,262	$ 9,085	$ 11,377	$ 12,079	$ 22,321	$ 42,803	$ (4,318)
Basic:
Weighted-average common shares outstanding	28,480	28,374	28,081	28,055	27,912	27,714	27,639	27,614	28,311	27,752	27,382
Basic (in dollars per share)	$ 0.30	$ 0.27	$ (0.27)	$ 0.31	$ 0.30	$ 0.27	$ 0.34	$ 0.36	$ 0.65	$ 1.28	$ (0.16)
Diluted:
Weighted-average shares outstanding used in basic calculation	28,480	28,374	28,081	28,055	27,912	27,714	27,639	27,614	28,311	27,752	27,382
Dilutive effect of options (in shares)									275	241	0
Dilutive effect of unvested restricted stock (in shares)									402	414	0
Weighted-average common stock and common stock equivalents (in shares)	29,160	28,968	28,722	28,785	28,341	28,087	27,934	27,987	28,988	28,407	27,382
Diluted (in dollars per share)	$ 0.30	$ 0.27	$ (0.27)	$ 0.30	$ 0.30	$ 0.27	$ 0.34	$ 0.36	$ 0.64	$ 1.25	$ (0.16)
Common Stock
Information related to EPS computation
Net income (loss) allocated to common shareholders (in dollars)									18,540	35,433	(4,318)
Basic:
Basic (in dollars per share)									$ 0.65	$ 1.28	$ (0.16)
Diluted:
Diluted (in dollars per share)									$ 0.64	$ 1.25	$ (0.16)
Common Stock | Continuing Operations
Information related to EPS computation
Net income (loss) allocated to common shareholders (in dollars)									18,540	35,433	(6,229)
Basic:
Basic (in dollars per share)									$ 0.65	$ 1.28	$ (0.23)
Diluted:
Diluted (in dollars per share)									$ 0.64	$ 1.25	$ (0.23)
Common Stock | Discontinued Operations
Information related to EPS computation
Net income (loss) allocated to common shareholders (in dollars)									0	0	1,911
Basic:
Basic (in dollars per share)									$ 0.00	$ 0.00	$ 0.07
Diluted:
Diluted (in dollars per share)									$ 0.00	$ 0.00	$ 0.07
Series A 3% Redeemable Convertible Preferred Stock
Information related to EPS computation
Net income (loss) allocated to common shareholders (in dollars)									3,781	7,370
Diluted:
Stock issuable upon conversion of the Series A Preferred Stock (in shares)									5,806	5,806	5,806
Stock awards excluded from calculation as their effect would be anti-dilutive (in shares)									479	787	2,531
Series A 3% Redeemable Convertible Preferred Stock | Continuing Operations
Information related to EPS computation
Net income (loss) allocated to common shareholders (in dollars)									$ 3,781	$ 7,370