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Income Taxes
9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]  
Income Taxes
At the end of each interim period, we estimate our annual effective tax rate and apply that rate to our interim earnings. We also record the tax impact of certain unusual or infrequently occurring items, including changes in judgment about valuation allowances and the effects of changes in tax laws or rates, in the interim period in which they occur.
The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in state and foreign jurisdictions, permanent and temporary differences between book and taxable income, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained or as the tax environment changes.    
Our effective income tax rate for the nine months ended September 30, 2015 was 34.8%, which was consistent with our full year 2014 effective tax rate of 34.7% as our estimate of the geographic distribution of pretax income for 2015 is similar to the actual 2014 allocation.  Our effective income tax rate for the nine months ended September 30, 2014 was 34.0%, which reflected our estimate at the time that our international operations would constitute a greater percentage of the consolidated pretax income than was actually realized in the full year results. We adjusted the tax rate in the fourth quarter of 2014 to recognize the actual geographic allocation.