Annual report pursuant to Section 13 and 15(d)

Other Expenses, Net (Details)

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Other Expenses, Net (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Income and Expenses [Abstract]                              
Unrealized loss from derivatives                         $ 98,027 $ 1,313,587 $ 1,346,041
Interest expense, net of interest income                         3,495,784 4,130,350 4,380,183
Amortization of deferred financing fees                         456,305 1,061,782 566,772
Other expenses, net $ 216 $ 1,313 $ 1,413 $ 1,108 $ 1,748 $ 2,696 $ 1,431 $ 631 $ (185) $ 2,751 $ 2,371 $ 1,356 $ 4,050,116 $ 6,505,719 $ 6,292,996