STOCK-BASED COMPENSATION (Details 3) (Stock options, USD $)	6 Months Ended
	Jun. 30, 2013
Stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	1,072,503
Exercised (in shares)	(19,958)
Expired (in shares)	(1,308)
Outstanding at the end of the period (in shares)	1,051,237
Options exercisable at the end of the period (in shares)	310,095
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 8.97
Exercised (in dollars per share)	$ 7.87
Expired (in dollars per share)	$ 10.37
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)	$ 10.97
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	5 years 2 months 26 days
Options exercisable at the end of the period	5 years 29 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 8,712,665
Options exercisable at the end of the period	$ 2,056,274