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Quarterly Financial Information (Schedule of Quarterly Financial Information (Unaudited)) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 8,159,667 $ 6,528,575 $ 7,081,088 $ 10,258,132 $ 13,696,366 $ 12,531,719 $ 12,366,940 $ 10,256,212 $ 32,027,462 $ 48,851,237 $ 51,142,776
Operating income (loss) (2,472,077) (1,514,768) (1,140,544) 1,326,051 3,252,993 2,979,163 1,939,931 646,015 (3,801,338) 8,818,102 9,849,487
Net income (loss) attributable to common shareholders $ (1,500,363) $ (819,942) $ (639,018) $ 854,709 $ 1,805,500 $ 1,869,494 $ 1,744,290 $ 423,208 $ (2,104,614) $ 5,842,492 $ 5,657,856
Earnings per share attributable to common shareholders (1)                      
Basic (in USD per share) $ (0.08) [1] $ (0.04) [1] $ (0.03) [1] $ 0.05 [1] $ 0.09 [1] $ 0.10 [1] $ 0.09 [1] $ 0.02 [1] $ (0.11) $ 0.30 $ 0.28
Diluted (in USD per share) $ (0.08) [1] $ (0.04) [1] $ (0.03) [1] $ 0.05 [1] $ 0.09 [1] $ 0.10 [1] $ 0.09 [1] $ 0.02 [1] $ (0.11) $ 0.30 $ 0.28
[1] Due to the nature of interim earnings per share calculations, the sum of the quarterly earnings per share amounts may not equal the reported earnings per share for the full year.