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CASH, CASH EQUIVALENTS, AND INVESTMENTS (Details) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Fair value of cash, cash equivalents, and investments    
Cash and cash equivalents$ 67,487,000$ 76,133,000$ 66,692,000$ 89,792,000
Short-term investments73,550,00045,557,000  
Long-term investments27,734,00021,298,000  
Total cash, cash equivalents and investments168,771,000142,988,000  
Gross unrealized gains on available-for-sale investments10,000 30,000 
Cash
    
Fair value of cash, cash equivalents, and investments    
Cash and cash equivalents1,188,00072,000  
Commercial paper
    
Fair value of cash, cash equivalents, and investments    
Cash and cash equivalents27,274,00054,655,000  
Money market and money market funds
    
Fair value of cash, cash equivalents, and investments    
Cash and cash equivalents39,025,00021,406,000  
Corporate bonds
    
Fair value of cash, cash equivalents, and investments    
Short-term investments68,395,00031,494,000  
Long-term investments27,734,00020,578,000  
Available-for-sale securities2,000,000   
Convertible corporate bonds
    
Fair value of cash, cash equivalents, and investments    
Short-term investments1,994,0004,346,000  
Certificates of deposit and time deposits
    
Fair value of cash, cash equivalents, and investments    
Short-term investments3,161,0009,717,000  
Long-term investments $ 720,000