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Derivative Financial Instruments (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of activity relating to the expired interest rate swap agreements designated as cash flow hedges        
Loss recognized in other comprehensive income    $ (18,267)    $ (36,662)
Loss reclassified from other comprehensive income to interest expense    $ 405,437    $ 1,187,409