Quarterly report pursuant to Section 13 or 15(d)

Income Taxes

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Income Taxes
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
We make estimates and judgments in determining income tax expense for financial statement purposes. These estimates and judgments occur in the calculation of certain tax assets and liabilities, which arise from differences in the timing of recognition of revenue and expense for tax and financial statement purposes.
Our provision for income taxes in interim periods is based on our estimated annual effective tax rate. We record cumulative adjustments in the quarter in which a change in the estimated annual effective rate is determined. The estimated annual effective tax rate calculation does not include the effect of discrete events that may occur during the year. The effect of these events, if any, is recorded in the quarter in which the event occurs.
Our effective income tax rate was 51.4% and 37.9% for the three months ended March 31, 2015 and 2014, respectively. Our effective tax rate fluctuated from the statutory rate predominantly due to a mix of earnings among various international tax jurisdictions; state taxes; and permanent differences, including stock compensation and the non-deductibility of contingent consideration related to acquisitions completed in prior years, in relation to our results of operations before income taxes.
The Company plans to filed amended 2013 and 2012 tax returns for selected states to correct certain items that were improperly deducted as detected by the Company subsequent to the initial filings. The primary effect of the amended returns did not result in a current tax liability and reduced the Company's net operating loss deferred tax asset by approximately $1.0 million at December 31, 2014.