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Fair Value Measurements (Details) (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Cash and cash equivalents$ 504,952$ 294,426$ 269,292$ 294,411
Short-term investments110,761146,586  
Long-term investments45,29746,033  
Long-term investment maturities - begin13 months from September 30, 2011   
Long term investment maturities - end23 months from September 30, 2011   
Fair Value
    
Cash and cash equivalents504,952294,426  
Long-term debt854,677[1]850,374[1]  
Fair Value | Certificates Of Deposit
    
Short-term investments 250[2],[3]  
Fair Value | Government Backed Securities
    
Short-term investments110,761[2],[3],[4]146,336[2],[3],[4]  
Long-term investments45,445[2],[4],[5]46,034[2],[4],[5]  
Book Value
    
Cash and cash equivalents504,952294,426  
Long-term debt875,997[1]863,657[1]  
Book Value | Certificates Of Deposit
    
Short-term investments 250[2],[3]  
Book Value | Government Backed Securities
    
Short-term investments110,761[2],[3],[4]146,336[2],[3],[4]  
Long-term investments$ 45,297[2],[4],[5]$ 46,033[2],[4],[5]  
[1]Excludes capital lease obligations and current portion of Long-term debt.
[2]Designated as held-to-maturity investments and recorded at amortized cost in the Consolidated Balance Sheet.
[3]Maturities are less than twelve months from the respective balance sheet dates.
[4]Includes U.S. treasuries and corporate notes guaranteed under the Federal Deposit Insurance Corporation’s Temporary Liquidity Guarantee Program.
[5]At September 30, 2011, maturities range between 13 and 23 months.