STOCK-BASED COMPENSATION (Details 4) (Stock options, USD $)	6 Months Ended
	Jun. 30, 2013
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	1,051,237
Options Outstanding - Weighted Average Remaining Contractual Term	5 years 2 months 26 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 8.99
Options Exercisable at the end of the period (in shares)	310,095
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 10.97
Range of exercise price $0.01 to $4.99
Stock options outstanding and exercisable by range of exercise prices
Exercise price, low end of the range (in dollars per share)	$ 0.01
Exercise price, high end of the range (in dollars per share)	$ 4.99
Options Outstanding at the end of the period (in shares)	365
Options Outstanding - Weighted Average Remaining Contractual Term	6 months 22 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 2.58
Options Exercisable at the end of the period (in shares)	365
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 2.58
Range of exercise price $5.00 to $7.45
Stock options outstanding and exercisable by range of exercise prices
Exercise price, low end of the range (in dollars per share)	$ 5.00
Exercise price, high end of the range (in dollars per share)	$ 7.45
Options Outstanding at the end of the period (in shares)	304,352
Options Outstanding - Weighted Average Remaining Contractual Term	8 years 2 months 16 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 6.65
Options Exercisable at the end of the period (in shares)	153,060
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 6.39
Range of exercise price $7.46 to $9.99
Stock options outstanding and exercisable by range of exercise prices
Exercise price, low end of the range (in dollars per share)	$ 7.46
Exercise price, high end of the range (in dollars per share)	$ 9.99
Options Outstanding at the end of the period (in shares)	608,949
Options Outstanding - Weighted Average Remaining Contractual Term	4 years 6 months 7 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 8.45
Options Exercisable at the end of the period (in shares)	19,099
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 7.55
Range of exercise price $10.00 to $14.99
Stock options outstanding and exercisable by range of exercise prices
Exercise price, low end of the range (in dollars per share)	$ 10.00
Exercise price, high end of the range (in dollars per share)	$ 14.99
Options Outstanding at the end of the period (in shares)	10,517
Options Outstanding - Weighted Average Remaining Contractual Term	1 year 3 months 4 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 12.26
Options Exercisable at the end of the period (in shares)	10,517
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 12.26
Range of exercise price $15.00 to $19.99
Stock options outstanding and exercisable by range of exercise prices
Exercise price, low end of the range (in dollars per share)	$ 15.00
Exercise price, high end of the range (in dollars per share)	$ 19.99
Options Outstanding at the end of the period (in shares)	80,391
Options Outstanding - Weighted Average Remaining Contractual Term	1 year 11 months 5 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 15.01
Options Exercisable at the end of the period (in shares)	80,391
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 15.01
Range of exercise price $20.00 to $24.99
Stock options outstanding and exercisable by range of exercise prices
Exercise price, low end of the range (in dollars per share)	$ 20.00
Exercise price, high end of the range (in dollars per share)	$ 24.99
Options Outstanding at the end of the period (in shares)	46,663
Options Outstanding - Weighted Average Remaining Contractual Term	1 year 11 months 8 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 20.19
Options Exercisable at the end of the period (in shares)	46,663
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 20.19