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Goodwill and Intangible Assets (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill and Intangible Assets (Textual) [Abstract]      
Aggregate amortization expense on intangible assets $ 1,821,170 $ 1,869,517 $ 1,913,912
Estimated aggregate amortization expense for 2013 1,771,000    
Estimated aggregate amortization expense for 2014 943,000    
Estimated aggregate amortization expense for 2015 870,000    
Estimated aggregate amortization expense for 2016 816,000    
Estimated aggregate amortization expense for 2017 775,000    
Estimated aggregate amortization expense thereafter 2,314,000    
Intangible assets, Net Book Value $ 7,489,315 $ 9,310,485