CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,650,973	$ 1,841,136
Property and equipment, accumulated depreciation and amortization	44,778,602	41,917,771
Debt issuance costs, accumulated amortization	$ 221,588	$ 3,594,511
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	31,085,289	30,902,314
Common stock, shares outstanding	31,085,289	30,902,314