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MARKETABLE SECURITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Proceeds from maturities and sales of available-for-sale marketable securities and related gross realized gains and losses      
Proceeds from maturities and sales of available-for-sale marketable securities $ 82,160 $ 205,944 $ 600,149
Gross realized gains 35,692 4,075 2,482
Gross realized losses $ 0 $ (5) $ (41)