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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 283,839 $ 222,514 $ 419,167 $ 359,331
Short-term investments 148,197 97,042    
Investments 11,953 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 262,866 211,087    
Total 262,866 211,087    
Level 2
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 20,973 11,427    
Short-term investments 142,388 95,279    
Total 163,361 106,706    
Level 3
        
Fair value amounts included in the carrying value of        
Short-term investments 5,809 1,763    
Investments 11,953 21,393    
Prepaid expenses and other current assets 660 225    
Other assets 1,026 1,704    
Total 19,448 25,085    
Total fair value
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 283,839 222,514    
Short-term investments 148,197 97,042    
Investments 11,953 21,393    
Prepaid expenses and other current assets 660 225    
Other assets 1,026 1,704    
Total $ 445,675 $ 342,878