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Income Taxes
6 Months Ended
Jun. 30, 2011
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
Income Taxes
Income taxes for interim periods have been computed using an estimated annual effective tax rate. This rate is revised, if necessary, at the end of each successive interim period to reflect the current estimate of the annual effective tax rate. At June 30, 2011, the Company estimates that its effective annual income tax rate for 2011 will approximate 37.4%.