STOCK-BASED COMPENSATION (Details 3) (Stock options, USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	1,072,503
Exercised (in shares)	(12,842)
Expired (in shares)	(676)
Outstanding at the end of the period (in shares)	1,058,985
Options exercisable at the end of the period (in shares)	266,554
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 8.97
Exercised (in dollars per share)	$ 7.54
Expired (in dollars per share)	$ 9.15
Outstanding at the end of the period (in dollars per share)	$ 8.99
Options exercisable at the end of the period (in dollars per share)	$ 11.88
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	5 years 6 months
Options exercisable at the end of the period	4 years 9 months 18 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 10,144
Options exercisable at the end of the period	$ 1,841