(GAIN) LOSS ON SALE OF ASSETS AND ASSET IMPAIRMENT CHARGES (Details 2) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 31, 2011 Sale and Leaseback of San Jose Corporate Headquarters option	Dec. 31, 2011 Sale and Leaseback of San Jose Corporate Headquarters	Aug. 30, 2011 Sale and Leaseback of San Jose Corporate Headquarters
Disposal disclosures
Tenure of lease (in months)				P7M
Lease rental payment per month				$ 200,000
Number of renewal options				2
Number of months of renewal options				3
Gain (Loss) on disposal
Sales price					(48,500,000)	(48,500,000)
Net book value of assets transferred					12,262,000	12,262,000
Transaction related costs					2,810,000
Gain on sale of assets	$ (35,310,000)	$ 99,767,000	$ (164,000)		$ (33,428,000)