Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Future minimum operating lease payments

Rent expenses totaled $1,178,840, $1,058,170, and $656,883 for the years ended December 31, 2012, 2011, and 2010, respectively.  Remaining minimum annual lease payments under the various operating leases for the year ending after December 31, 2012 are as follows:

Year Ending December 31,	Minimum lease payments
2013	$	1,021,054
2014		879,638
2015		804,341
2016		32,625
2017		-
Thereafter		-