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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details 8) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Available-for-sale investments  
Amortized cost $ 31,000
Estimated fair value 31,000
Convertible bonds of privately-held company
 
Available-for-sale investments  
Amortized cost 23,000
Estimated fair value 23,000
Preferred convertible shares of privately-held company
 
Available-for-sale investments  
Amortized cost 8,000
Estimated fair value $ 8,000