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INVESTMENTS (Details 2) (Auction rate securities, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Auction rate securities
   
Net gain recognized through earnings on trading securities    
Gain on trading securities sold $ 1,034 $ 126
Gain on trading securities held 753 152
Gain on trading securities $ 1,787 $ 278