STOCK-BASED COMPENSATION (Details - Range of Stock Option Exercise Prices) (Stock options, USD $)	3 Months Ended
	Mar. 31, 2014
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	1,079,054
Options Outstanding - Weighted Average Remaining Contractual Term	4 years 8 months 27 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 9.95
Options Exercisable at the end of the period (in shares)	935,005
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 9.23
Range of exercise price $0.01 to $4.99
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	15
Options Outstanding - Weighted Average Remaining Contractual Term	1 month 13 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 1.52
Options Exercisable at the end of the period (in shares)	15
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 1.52
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
Range of exercise price $5.00 to $7.45
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	304,032
Options Outstanding - Weighted Average Remaining Contractual Term	7 years 5 months 19 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 6.65
Options Exercisable at the end of the period (in shares)	202,740
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 6.65
Exercise price, low end of the range (in dollars per share)	$ 5
Exercise price, high end of the range (in dollars per share)	$ 7.45
Range of exercise price $7.46 to $9.99
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	601,783
Options Outstanding - Weighted Average Remaining Contractual Term	3 years 9 months 11 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 8.46
Options Exercisable at the end of the period (in shares)	601,783
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 8.46
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
Range of exercise price $10.00 to $14.99
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	3,679
Options Outstanding - Weighted Average Remaining Contractual Term	6 months 22 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 12.25
Options Exercisable at the end of the period (in shares)	3,679
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 12.25
Exercise price, low end of the range (in dollars per share)	$ 10
Exercise price, high end of the range (in dollars per share)	$ 14.99
Range of exercise price $15.00 to $19.99
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	80,125
Options Outstanding - Weighted Average Remaining Contractual Term	1 year 2 months 5 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 15.00
Options Exercisable at the end of the period (in shares)	80,125
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 15.00
Exercise price, low end of the range (in dollars per share)	$ 15
Exercise price, high end of the range (in dollars per share)	$ 19.99
Range of exercise price $20.00 to $33.59
Stock options outstanding and exercisable by range of exercise prices
Options Outstanding at the end of the period (in shares)	89,420
Options Outstanding - Weighted Average Remaining Contractual Term	5 years 4 months 6 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 26.60
Options Exercisable at the end of the period (in shares)	46,663
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 20.19
Exercise price, low end of the range (in dollars per share)	$ 20
Exercise price, high end of the range (in dollars per share)	$ 33.59