NET INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net income	$ 29,734	$ 9,915	$ 14,656
Denominator:
Denominator for basic net income per share — weighted-average outstanding shares	27,670,000	26,533,000	23,131,000
Effect of dilutive securities:
Stock options and restricted stock (in shares)	542,000	416,000	396,000
Denominator for diluted net income per share — weighted-average outstanding shares	28,212,000	26,949,000	23,527,000
Net income per share — basic (in dollars per share)	$ 1.07	$ 0.37	$ 0.63
Net income per share — diluted (in dollars per share)	$ 1.05	$ 0.37	$ 0.62
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)	0	0	2,300