Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company generally provides for income taxes in interim periods based on the estimated annual effective tax rate for the year, adjusting for discrete items in the quarter in which they arise. For the three month ended September 30, 2017, the provision for income taxes was computed based on the actual effective tax rate for the year-to-date by applying the discrete method. The Company determined that as small changes in estimated “ordinary” income result in significant changes in the estimated annual effective tax rate, the actual effective tax rate provided a more accurate income tax provision for the reporting period ended September 30, 2017. The estimated effective tax rate before discrete items was 34.4% and 38.3% for the nine months ended September 30, 2017 and 2016, respectively. The estimated effective tax rate for the nine months ended September 30, 2017 differed from the statutory rate of 35% primarily due to the unfavorable impact of state income taxes, foreign rate differential, and non-deductible equity charges, which were partially offset by the favorable impact of the Research & Development credits. The effective tax rate for the nine months ended September 30, 2016 differed from the statutory rate of 35% primarily due to the favorable impact of the IRS settlement and release of tax reserves, the domestic production activities deduction, Research & Development credits and a calculated benefit in state income taxes, offset by unfavorable items such as non-deductible transaction costs related to the Aesynt transaction, and non-deductible equity charges under ASC 740-718. As of September 30, 2017 and December 31, 2016, the Company had gross unrecognized tax benefits of $6.8 million and $6.5 million, respectively. It is the Company’s policy to classify accrued interest and penalties as part of the unrecognized tax benefits, but to record interest and penalties in operating expense. As of September 30, 2017 and December 31, 2016, the amount of accrued interest and penalties was $1.2 million and $0.7 million, respectively. As of September 30, 2017, calendar years 2011 and thereafter are open and subject to potential examination in one or more jurisdictions. However, our research credit carryforwards that may be used in future years are subject to adjustment, if and when utilized. As such our federal and California tax years remain open from 2015 and 1992, respectively. During fiscal 2016, the Internal Revenue Service and the Company settled all outstanding items related to the audit of the Company's federal income tax returns for the fiscal year ended December 31, 2014. Although the Company believes it has adequately provided for uncertain tax positions, the provisions on these positions may change as revised estimates are made or the underlying matters are settled or otherwise resolved. It is not possible at this time to reasonably estimate changes in the unrecognized tax benefits within the next twelve months.

Income Taxes

The Company generally provides for income taxes in interim periods based on the estimated annual effective tax rate for the year, adjusting for discrete items in the quarter in which they arise. For the three month ended September 30, 2017, the provision for income taxes was computed based on the actual effective tax rate for the year-to-date by applying the discrete method. The Company determined that as small changes in estimated “ordinary” income result in significant changes in the estimated annual effective tax rate, the actual effective tax rate provided a more accurate income tax provision for the reporting period ended September 30, 2017. The estimated effective tax rate before discrete items was 34.4% and 38.3% for the nine months ended September 30, 2017 and 2016, respectively.

The estimated effective tax rate for the nine months ended September 30, 2017 differed from the statutory rate of 35% primarily due to the unfavorable impact of state income taxes, foreign rate differential, and non-deductible equity charges, which were partially offset by the favorable impact of the Research & Development credits. The effective tax rate for the nine months ended September 30, 2016 differed from the statutory rate of 35% primarily due to the favorable impact of the IRS settlement and release of tax reserves, the domestic production activities deduction, Research & Development credits and a calculated benefit in state income taxes, offset by unfavorable items such as non-deductible transaction costs related to the Aesynt transaction, and non-deductible equity charges under ASC 740-718.

As of September 30, 2017 and December 31, 2016, the Company had gross unrecognized tax benefits of $6.8 million and $6.5 million, respectively. It is the Company’s policy to classify accrued interest and penalties as part of the unrecognized tax benefits, but to record interest and penalties in operating expense. As of September 30, 2017 and December 31, 2016, the amount of accrued interest and penalties was $1.2 million and $0.7 million, respectively.

As of September 30, 2017, calendar years 2011 and thereafter are open and subject to potential examination in one or more jurisdictions. However, our research credit carryforwards that may be used in future years are subject to adjustment, if and when utilized. As such our federal and California tax years remain open from 2015 and 1992, respectively. During fiscal 2016, the Internal Revenue Service and the Company settled all outstanding items related to the audit of the Company's federal income tax returns for the fiscal year ended December 31, 2014.

Although the Company believes it has adequately provided for uncertain tax positions, the provisions on these positions may change as revised estimates are made or the underlying matters are settled or otherwise resolved. It is not possible at this time to reasonably estimate changes in the unrecognized tax benefits within the next twelve months.