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Fair Value Of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Of Financial Instruments [Abstract] 
Schedule Of Carrying Amount And Estimated Fair Value

September 30,

December 31,

2011

2010

Carrying Amount

 $  1,538,456

 $  1,560,389

Estimated Fair Value

     1,599,070

     1,483,816