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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Taxes (Textual) [Abstract]    
Effective tax rate 28.00% 33.00%
U.S. federal statutory tax rate 35.00%  
Gross unrecognized tax benefits $ 1.4  
Unrecognized tax benefits $ 0.2