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INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Investments    
Taxes on Unrealized Gains on Investments $ 1,005 $ 0
Adjusted Cost 4,919 5,319
Unrealized gains 83 31
Unrealized losses (1,800) (20)
Net unrealized (losses) gains, excluding taxes of $1,005 and $0, respectively (1,717) 11
Fair Value 3,202 5,330
Amount included in short-term investments 2,136 3,079
Amount included in other assets 1,066 2,251
Contractual maturities (at adjusted cost) of available-for-sale debt securities    
Due after 10 years 983  
Total 983  
Minimum maturity period of short-term investments as company has the ability and intent to redeem them within the year (in days) 90 days  
Corporate equity securities
   
Investments    
Adjusted Cost 3,936 0
Fair Value 2,136 0
Auction-rate securities
   
Investments    
Adjusted Cost 983 2,220
Fair Value 1,066 2,251
Corporate debt securities and other obligations
   
Investments    
Adjusted Cost 0 3,099
Fair Value $ 0 $ 3,079