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Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes For interim reporting periods, the Company’s provision for income taxes is calculated using its annualized estimated effective tax rate for the year. This rate is based on our estimated full-year income and the related income tax expense for each jurisdiction in which we operate. Changes in the geographical mix, permanent differences or estimated level of annual pre-tax income can impact the Company’s actual effective rate. This rate is adjusted for the effects of discrete items occurring in the quarter. During the three and six months ended June 30, 2017, there were net excess tax benefits of $0.5 million and $1.6 million, respectively, related to stock-based compensation, which are treated as discrete items.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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