Annual report pursuant to Section 13 and 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) (Designated as Hedging Instrument, Interest Rate Swap, USD $)
12 Months Ended
Dec. 31, 2012
Designated as Hedging Instrument | Interest Rate Swap
 
Derivative Instruments, Gain (Loss) [Line Items]  
Loss Recognized in Accumulated Other Comprehensive Income $ 666,563
Loss Reclassified from Accumulated Other Comprehensive Income $ 1,306,270