Quarterly Results (Unaudited) (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, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Results (Unaudited)
Net revenues	$ 27,922,970	$ 30,770,456	$ 30,524,011	$ 26,686,579	$ 27,435,237	$ 28,914,071	$ 29,664,706	$ 27,622,019	$ 115,904,016	$ 113,636,033	$ 95,932,223
Income (loss) from operations	(114,228,048)	5,985,397	9,353,398	438,664	380,692	3,083,102	349,489	(1,474,685)	(98,450,589)	2,338,598	(14,345,817)
Net income (loss)	$ (87,656,965)	$ (3,846,124)	$ 3,910,819	$ (4,399,085)	$ (4,999,457)	$ 526,600	$ (2,826,563)	$ (8,545,962)	$ (91,991,355)	$ (15,845,382)	$ (30,844,897)
Income(loss)per common share
Basic (in dollars per share)	$ (1.98)	$ (0.09)	$ 0.09	$ (0.10)	$ (0.11)	$ 0.01	$ (0.06)	$ (0.19)	$ (2.08)	$ (0.35)	$ (0.78)
Diluted (in dollars per share)	$ (1.98)	$ (0.09)	$ 0.09	$ (0.10)	$ (0.11)	$ 0.01	$ (0.06)	$ (0.19)	$ (2.08)	$ (0.35)	$ (0.78)
Weighted average shares outstanding
Basic (in shares)	44,269,388	44,208,471	44,134,330	43,976,950	43,904,661	45,121,172	45,188,542	44,939,828	44,147,787	44,788,551	39,397,486
Diluted (in shares)	44,269,388	44,208,471	44,992,883	43,976,950	43,904,661	45,166,566	45,188,542	44,939,828	44,147,787	44,788,551	39,397,486