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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Taxes (Textual) [Abstract]        
Effective tax rate 31.00% 35.00% 32.00% 34.00%
U.S. federal statutory tax rate     35.00%  
Gross unrecognized tax benefits $ 1.3   $ 1.3  
Unrecognized tax benefits 0.2   0.2  
Additional unrecognized tax benefit $ 0.5