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Derivative Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Financial Instruments [Abstract]  
Fair Value Of Derivative Instruments Included In Balance Sheets
  Liability Derivatives
 
  Balance Sheet Location Fair Value
    June 30, December 31,
      2012   2011
Derivatives designated as hedging instruments:          
Interest rate swap contracts Other liabilities $ 23,539 $ 19,091
Total derivatives   $ 23,539 $ 19,091
Schedule Of Gains And Losses Related To Derivative Instruments