EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic
Net income, basic	$ 2,138	$ 6,865	$ 8,003	$ 16,226
Weighted average basic shares outstanding	21,617,000	21,528,000	21,600,000	21,503,000
Earnings per share (in dollars per share)	$ 0.10	$ 0.32	$ 0.37	$ 0.75
Diluted
Net income, diluted	$ 2,138	$ 6,865	$ 8,003	$ 16,226
Weighted average basic shares outstanding	21,617,000	21,528,000	21,600,000	21,503,000
Dilutive effect of stock-based awards (in shares)	131,000	139,000	119,000	129,000
Weighted average diluted shares outstanding	21,748,000	21,667,000	21,719,000	21,632,000
Earnings per share (in dollars per share)	$ 0.10	$ 0.32	$ 0.37	$ 0.75
Anti-dilutive shares excluded from calculation	178,000	36,000	197,000	36,000