Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Effects of Derivative Instruments in Accumulated Other Comprehensive Income (Details)

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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments in Accumulated Other Comprehensive Income (Details) (Derivatives Designated as Hedging Instrument [Member], Interest Rate Swap Contracts [Member], USD $)
6 Months Ended
Jun. 30, 2012
Derivatives Designated as Hedging Instrument [Member] | Interest Rate Swap Contracts [Member]
 
Derivative Instruments, Gain (Loss) [Line Items]  
Gain Recognized in Accumulated Other Comprehensive Income $ 448,034
Loss Reclassified from Accumulated Other Comprehensive Income $ (804,299)