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MARKETABLE SECURITIES - SCHEDULE OF PROCEEDS FROM MATURITIES AND SALES OF CURRENT AVAILABLE-FOR-SALE-MARKETABLE SECURITIES (Details 2) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 28, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Marketable Securities [Abstract]          
Proceeds from maturities and sales of available-for-sale marketable securities     $ 218,976 $ 25,223 $ 82,160
Gross realized gains     443 3,362 35,692
Gross realized losses   $ 300 $ 0 $ 0 $ 0
Match Group | PlentyOfFish          
Business Acquisition          
Purchase price $ 575,000