10.

INCOME TAXES

The Company’s effective tax rate for the six months ended June 30, 2015 and 2014 was 36.8% and 37.6% respectively, which resulted in expense of $21.1 million and $16.5 million, respectively.

The Company analyzes its deferred tax assets in each reporting period, considering all available positive and negative evidence, in determining the expected realization of those deferred tax assets. As of June 30, 2015, the Company maintains a valuation allowance of $4.5 million against deferred tax assets related to state tax credits it estimates will expire before they are realized.

During the six months ended June 30, 2015, the Company realized $1.8 million of excess tax benefits from stock-based awards and, accordingly, recorded an increase to additional paid-in capital.

The Company operates in multiple tax jurisdictions and, in the normal course of business, its tax returns are subject to examination by various taxing authorities. Such examinations may result in future assessments by these taxing authorities, and the Company accrues a liability when it believes that it is more likely than not that benefits of tax positions will not be realized. The Company believes that adequate provisions have been made for all tax returns subject to examination. As of June 30, 2015, federal tax years 2011 through 2014 remain subject to examination. Sales made to foreign distributors are not taxable in any foreign jurisdictions as the Company does not have a taxable presence in any foreign jurisdiction.