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Income Taxes (Notes) | 3 Months Ended
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Mar. 31, 2019
Income Taxes [Abstract] |
Income Tax Disclosure | Income Taxes Income tax expense during interim periods is based on our estimated annual effective income tax rate plus any discrete items, which are recorded in the period in which they occur. Discrete items include, among others, such events as changes in estimates due to the finalization of tax returns, tax audit settlements, expiration of statutes of limitation, and increases or decreases in valuation allowances on deferred tax assets. Our effective tax rate was 21.0% and 25.7% for the three months ended March 31, 2019 and 2018, respectively. The lower effective tax rate for the March 31, 2019 was primarily due to higher excess tax benefits on increased exercises of stock options. Unrecognized Tax Benefits As of March 31, 2019, the total amount of our unrecognized tax benefits was $1.4 million, and the total amount of our accrued interest was $0.5 million. The federal statutes of limitations have expired for all tax years prior to 2015, and we are not currently under audit by the IRS. Various state jurisdictions are auditing years 2009 through 2017. There are currently no federal or provincial audits in Canada; however, years subsequent to 2013 remain open and could be subject to examination. It is reasonably possible that the amount of unrecognized tax benefits may change within the next twelve months. However, given the number of years that remain subject to examination and the number of matters being examined, an estimate of the range of the possible increase or decrease cannot be made.

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- Definition Income Taxes [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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