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Goodwill and Intangible Assets (Details 1) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Goodwill and Intangible Assets (Textual) [Abstract]    
Aggregate amortization expense on intangible assets $ 447,927 $ 460,616
Estimated aggregate amortization expense for remaining of 2013 1,300,000  
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 for 2018 $ 773,000