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INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Investments    
Adjusted Cost $ 8,195 $ 5,319
Unrealized gains 4,811 31
Unrealized losses (1) (20)
Net unrealized (losses) gains 4,810 11
Fair Value 13,005 5,330
Amount included in short-term investments 10,754 3,079
Amount included in other assets 2,251 2,251
Contractual maturities (at adjusted cost) of available-for-sale debt securities    
Due within one year 2,039  
Due after 10 years 2,220  
Total 4,259  
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  
Fair Value 8,716  
Auction-rate securities
   
Investments    
Adjusted Cost 2,220 2,220
Fair Value 2,251 2,251
Amount included in adjusted cost 2,251 2,251
Corporate debt securities and other obligations
   
Investments    
Adjusted Cost 2,039 3,099
Fair Value $ 2,038 $ 3,079