STOCK-BASED COMPENSATION (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Stock options outstanding and stock options exercisable
Stock options outstanding (in shares)	18,569
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	4.1
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.57
Options Exercisable (in shares)	14,366
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.17
Range of Exercise Prices $0.22 - $0.22
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 0.22
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 0.22
Stock options outstanding (in shares)	1,793
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	0.5
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.23
Options Exercisable (in shares)	1,793
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.22
Range of Exercise Prices $0.27 - $0.27
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 0.27
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 0.27
Stock options outstanding (in shares)	3,441
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	1.4
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.27
Options Exercisable (in shares)	3,441
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.27
Range of Exercise Prices $2.09 - $2.09
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 2.09
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 2.09
Stock options outstanding (in shares)	68
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	3.0
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 2.09
Options Exercisable (in shares)	68
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.09
Range of Exercise Prices $3.29 - $3.29
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 3.29
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 3.29
Stock options outstanding (in shares)	4,400
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	3.2
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 3.29
Options Exercisable (in shares)	4,400
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 3.29
Range of Exercise Prices $5.64 - $6.21
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 5.64
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 6.21
Stock options outstanding (in shares)	57
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	3.8
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.13
Options Exercisable (in shares)	57
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.13
Range of Exercise Prices $8.44 - $8.44
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 8.44
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 8.44
Stock options outstanding (in shares)	2,458
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	3.9
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.44
Options Exercisable (in shares)	2,458
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.44
Range of Exercise Prices $11.36 - $15.60
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 11.36
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 15.60
Stock options outstanding (in shares)	266
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	6.8
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.49
Options Exercisable (in shares)	119
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 13.42
Range of Exercise Prices $15.86 - $15.86
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 15.86
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 15.86
Stock options outstanding (in shares)	2,163
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	6.4
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.86
Options Exercisable (in shares)	1,066
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.86
Range of Exercise Prices $15.94 - $18.07
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 15.94
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 18.07
Stock options outstanding (in shares)	2,024
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	7.8
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 17.76
Options Exercisable (in shares)	606
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 17.78
Range of Exercise Prices $18.64 - $46.04
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	$ 18.64
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 46.04
Stock options outstanding (in shares)	1,899
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	7.9
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 25.39
Options Exercisable (in shares)	358
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 22.24