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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Taxes (Textual) [Abstract]          
Liability for uncertain tax positions totaled $ 128,000   $ 128,000   $ 52,000
Income tax expense 623,000 798,000 3,524,000 2,606,000  
income tax provision 16.00% 25.60% 31.10% 32.00%  
Tax benefit of research and development income tax Credits $ 708,000