EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
EARNINGS PER SHARE
Net income (loss)	$ 8,750	$ (19,180)	$ (3,241)	$ 1,733	$ (630)	$ 5,010	$ (3,419)	$ (2,298)	$ (11,938)	$ (1,337)	$ 11,110
Less: amounts allocated to nonvested shares											(113)
Basic net income (loss) available to common stockholders									$ (11,938)	$ (1,337)	$ 10,997
Weighted Average Common Shares Outstanding (Denominator)
Weighted Average Common Shares Outstanding Basic									36,584	35,512	35,434
Effect of dilutive securities											868
Weighted Average Common Shares Outstanding Diluted									36,584	35,512	36,302
Net loss per common share
Basic net income (loss) per common share	$ 0.24	$ (0.52)	$ (0.09)	$ 0.05	$ (0.02)	$ 0.14	$ (0.10)	$ (0.07)	$ (0.33)	$ (0.04)	$ 0.31
Diluted net income (loss) per common share	$ 0.24	$ (0.52)	$ (0.09)	$ 0.05	$ (0.02)	$ 0.14	$ (0.10)	$ (0.07)	$ (0.33)	$ (0.04)	$ 0.30
Antidilutive securities excluded from computation of diluted net income per share
Stock options and nonvested shares excluded as their inclusion would be anti-dilutive									2,700	3,400	2,000