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) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gain (loss) from interest rate hedge, net of tax effect of $614,203, $0 and $0, respectively $ 3,426,903 $ (666,563) $ (3,135,402)
Designated as Hedging Instrument | Interest Rate Swap
     
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gain (loss) from interest rate hedge, net of tax effect of $614,203, $0 and $0, respectively $ 3,426,903