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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details 8) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Available-for-sale investments  
Amortized cost $ 63,113
Realized Losses for More Than 12 months 9,142
Estimated fair value 53,971
Convertible bonds of privately-held company
 
Available-for-sale investments  
Amortized cost 55,113
Realized Losses for More Than 12 months 9,142
Estimated fair value 45,971
Preferred convertible shares of privately-held company
 
Available-for-sale investments  
Amortized cost 8,000
Estimated fair value $ 8,000