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Derivative Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Financial Instruments [Abstract]  
Summary of activity relating to the expired interest rate swap agreements designated as cash flow hedges
                 
    Three months ended June 30,  
    2011     2012  

Loss recognized in other comprehensive income

  $ (18,267   $ —    

Loss reclassified from other comprehensive income to interest expense

      405,437       —    

 

                 
      Six months ended June 30,    
    2011     2012  

Loss recognized in other comprehensive income

  $ (36,662   $ —    

Loss reclassified from other comprehensive income to interest expense

    1,187,409       —