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Income Taxes
3 Months Ended
Mar. 31, 2017
Income Taxes [Abstract]  
Income Taxes
NOTE H – Income Taxes

Our tax provision for interim periods is determined using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a year to date adjustment.

Our effective tax rate for the three months ended March 31, 2017 and 2016 was 38.5%. The primary difference in the effective rate and the statutory rate is due to state income taxes.