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Long-term Debt (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Debt Instrument [Line Items]  
Notional Amount Of Derivatives$ 850,000,000 
Proceeds (payments) for settlement of derivative instruments0(31,774,000)
Debt Due 2012 [Member]
  
Debt Instrument [Line Items]  
Notional Amount Of Derivatives400,000,000 
Debt Instrument Interest Rate Stated Percentage4.625% 
Debt Instrument Face Amount400,000,000 
Debt Due 2014 [Member]
  
Debt Instrument [Line Items]  
Notional Amount Of Derivatives450,000,000 
Debt Instrument Interest Rate Stated Percentage4.875% 
Debt Instrument Face Amount450,000,000 
Debt Due 2014 [Member] | Three Month L I B O R 305 [Member]
  
Debt Instrument [Line Items]  
Notional Amount Of Derivatives450,000,000 
Debt Instrument Interest Rate Stated Percentage4.875% 
Debt Instrument Face Amount$ 450,000,000