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MARKETABLE SECURITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]        
Available for sale securities, equity securities acquired   $ 0   $ 5,779
Available for sale securities, equity securities purchased $ 32,159 0    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 23,323 0 $ 0  
Available-for-sale Securities, Equity Securities, Current 14,615 0    
Member 2 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available for sale securities, equity securities purchased 32,200      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 19,100      
Available-for-sale Securities, Equity Securities, Current 13,100 0    
Member 1 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available for sale securities, equity securities acquired       $ 5,700
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 4,200      
Available-for-sale Securities, Equity Securities, Current $ 1,500 $ 0