NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net income (loss)	$ (3,465)	$ 44,869	$ 29,734
Denominator:
Denominator for basic net income (loss) per share — weighted-average outstanding shares	31,950,000	30,215,000	27,670,000
Effect of dilutive securities:
Stock options and restricted stock (in shares)	0	426,000	542,000
Denominator for diluted net income (loss) per share — weighted-average outstanding shares	31,950,000	30,641,000	28,212,000
Net income (loss) per share — basic (in dollars per share)	$ (0.11)	$ 1.48	$ 1.07
Net income (loss) per share — diluted (in dollars per share)	$ (0.11)	$ 1.46	$ 1.05
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	56,000	24,000	379,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		80,000	0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	55,000	23,000	379,000
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,000	1,000	0