Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.6
Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) (Interest Rate Swap Contracts [Member], Other Liabilities [Member], USD $)
Mar. 31, 2013
Dec. 31, 2012
Derivatives Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value $ 5,107,499 $ 5,590,519
Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value $ 2,357,649 $ 2,624,063