STOCK-BASED COMPENSATION (Details 2) (Stock options, USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock options
Stock Options
Vesting period	4 years
Contractual term of stock option grants	7 years
Shares
Outstanding at beginning of period (in shares)	42,116
Exercised (in shares)	(39,751)
Outstanding at end of period (in shares)	2,365
Vested or expected to vest at end of period (in shares)	2,365
Exercisable at end of period (in shares)	2,365
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 20.75
Exercised (in dollars per share)	$ 21.09
Outstanding at end of period (in dollars per share)	$ 14.95
Vested or expected to vest at end of period (in dollars per share)	$ 14.95
Exercisable at end of period (in dollars per share)	$ 14.95
Share based compensation plan, additional disclosures
Outstanding at end of period, Weighted Average Remaining Contractual Term	9 months 7 days
Vested or expected to vest at end of period, Weighted Average Remaining Contractual Term	9 months 7 days
Exercisable at end of period, Weighted Average Remaining Contractual Term	9 months 7 days
Outstanding at end of period, Aggregate Intrinsic Value	$ 60
Vested or expected to vest at end of period, Aggregate Intrinsic Value	60
Exercisable at end of period, Aggregate Intrinsic Value	60
Intrinsic value of options exercised (in dollars)	$ 693	$ 194