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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Summary of Available-for-sale Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 50,999 $ 55,797
Cash Collection (12,299)  
Impairment charges and equity losses (22,800) 5,971
Transfer-out from available-for-sale investments (10,000)  
Realized gain (200) 673
Estimated fair value 5,700 50,499
Security of a public company [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 2,299  
Cash Collection $ (2,299)  
Impairment charges and equity losses  
Transfer-out from available-for-sale investments  
Realized gain  
Estimated fair value  
Convertible bonds of privately-held company [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 40,700 45,971
Cash Collection (10,000)  
Impairment charges and equity losses (20,000) 5,971
Transfer-out from available-for-sale investments (10,000)  
Realized gain (200) 200
Estimated fair value 500 40,200
Preferred convertible shares of privately-held company [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 8,000 $ 8,000
Cash Collection  
Impairment charges and equity losses $ (2,800)
Transfer-out from available-for-sale investments  
Realized gain
Estimated fair value $ 5,200 $ 8,000
Securities of Public Company [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost   $ 1,826
Impairment charges and equity losses  
Realized gain   $ 473
Estimated fair value   $ 2,299