EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
NET INCOME PER SHARE
Net income (loss)	$ (630)	$ 5,010	$ (3,419)	$ (2,298)	$ 96	$ 4,235	$ 2,842	$ 3,937	$ (1,337)	$ 11,110	$ 22,427
Less: amounts allocated to nonvested shares										(113)	(268)
Basic net income (loss) available to common stockholders									$ (1,337)	$ 10,997	$ 22,159
Weighted Average Common Shares Outstanding (Denominator)
Weighted Average Common Shares Outstanding Basic									35,512,000	35,434,000	35,497,000
Effect on weighted average common shares outstanding from dilutive securities										868,000	876,000
Weighted Average Common Shares Outstanding Diluted									35,512,000	36,302,000	36,373,000
Per Share Amount
Basic net income (loss) available to common stockholders (in dollars per share)	$ (0.02)	$ 0.14	$ (0.10)	$ (0.07)	$ 0.00	$ 0.12	$ 0.08	$ 0.11	$ (0.04)	$ 0.31	$ 0.62
Diluted net income (loss) available to common stockholders (in dollars per share)	$ (0.02)	$ 0.14	$ (0.10)	$ (0.07)	$ 0.00	$ 0.11	$ 0.08	$ 0.11	$ (0.04)	$ 0.30	$ 0.61
Antidilutive securities excluded from computation of diluted net income per share
Anti-dilutive securities (in shares)									3,400,000	2,000,000	3,100,000