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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 242,533 $ 222,514 $ 391,438 $ 359,331
Short-term investments 102,139 97,042    
Investments 13,631 21,393    
Asset transfers between Level 1 and Level 2 measurements 0 0    
Level 1
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 229,996 211,087    
Total 229,996 211,087    
Level 2
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 12,537 11,427    
Short-term investments 98,400 95,279    
Total 110,937 106,706    
Level 3
        
Fair value amounts included in the carrying value of        
Short-term investments 3,739 1,763    
Investments 13,631 21,393    
Prepaid expenses and other current assets 491 225    
Other assets 1,520 1,704    
Total 19,381 25,085    
Total fair value
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 242,533 222,514    
Short-term investments 102,139 97,042    
Investments 13,631 21,393    
Prepaid expenses and other current assets 491 225    
Other assets 1,520 1,704    
Total $ 360,314 $ 342,878