Property and Equipment (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property and Equipment (Textual)
Depreciation expense	$ 6,519,394	$ 5,351,359
Depreciation included in cost of revenues and operating expenses	4,983,679	4,238,590
Non-cancelable capital lease expiration date	Jun. 03, 2014	Jun. 03, 2014
Capital leased assets	785,583	791,628
Depreciation related to capital lease asset	$ 71,204	$ 0