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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Derivative Financial Instruments [Abstract]  
Summary of activity relating to the expired interest rate swap agreements designated as cash flow hedges

A summary of activity relating to the expired interest rate swap agreements is as follows:

 

                 
    Year ended December 31,  
    2011     2012  

Loss recognized in other comprehensive income

  $ (36,389   $ —    

Loss reclassified from other comprehensive income to interest expense

    1,590,905       —