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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value of Financial Instruments [Abstract]  
Schedule of Carrying Amount and Estimated Fair Value
    June 30,   December 31,
    2011   2010
Carrying Amount $ 1,559,027 $ 1,560,389
Estimated Fair Value   1,586,315   1,483,816