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INVESTMENTS: (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Fair Value less than 1 Year $ 2,550 $ 1,235
Available-for-sale Securities, Unrealized Losses less than 1 Year (31) (11)
Available-for-sale Securities, Fair Value greater than 1 Year 0 0
Available-for-sale Securities, Unrealized Losses greater than 1 Year 0 0
Available For Sale Securities, Total Unrealized Losses (31) (11)
Corporate Debt Securities [Member]
   
Available-for-sale Securities, Fair Value less than 1 Year 1,075  
Available-for-sale Securities, Unrealized Losses less than 1 Year (7)  
Available-for-sale Securities, Fair Value greater than 1 Year 0  
Available-for-sale Securities, Unrealized Losses greater than 1 Year 0  
Available For Sale Securities, Total Unrealized Losses (7)  
Mutual Funds [Member]
   
Available-for-sale Securities, Fair Value less than 1 Year 1,475 1,235
Available-for-sale Securities, Unrealized Losses less than 1 Year (24) (11)
Available-for-sale Securities, Fair Value greater than 1 Year 0 0
Available-for-sale Securities, Unrealized Losses greater than 1 Year 0 0
Available For Sale Securities, Total Unrealized Losses $ (24) $ (11)