Property and Equipment (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Property and Equipment (Textual)
Depreciation expense	$ 1,569,551	$ 1,547,345
Depreciation included in cost of revenues	1,462,337	1,172,733
Non-cancelable capital lease expiration date	Jun. 03, 2014
Capital leased assets	795,976		791,628
Depreciation related to capital lease asset	$ 17,897	$ 0