Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details)

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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) (Interest Rate Swap, Other Liabilities, USD $)
Dec. 31, 2012
Dec. 31, 2011
Designated as Hedging Instrument
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 5,590,519 $ 4,185,925
Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 2,624,063 $ 2,526,036