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FAIR VALUE OF FINANCIAL INSTRUMENTS-Quoted Market Prices (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair value of financial instruments    
Investments $ 12,334 $ 12,327
Quoted Market Prices in Active Markets (Level 1)    
Fair value of financial instruments    
Investments $ 12,334 $ 12,327