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MARKETABLE SECURITIES (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 14, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Proceeds from maturities and sales of current and non-current available-for-sale marketable securities and related gross realized gains and losses          
Proceeds from maturities and sales of available-for-sale marketable securities   $ 8,563 $ 3,462 $ 14,613 $ 3,462
Gross realized gains   5 $ 2,299 5 2,299
Impairment of available-for-sale marketable securities       $ 500 $ 64,281
Subsequent Event | PlentyOfFish          
Proceeds from maturities and sales of current and non-current available-for-sale marketable securities and related gross realized gains and losses          
Purchase price $ 575,000        
Corporate debt securities          
Proceeds from maturities and sales of current and non-current available-for-sale marketable securities and related gross realized gains and losses          
Impairment of available-for-sale marketable securities   $ 300