Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The Internal Revenue Service (the “IRS”) has completed examinations of the Company’s U.S. income tax returns or the statute of limitations has passed on returns for the years through 2010. The Company’s 2011 through 2015 U.S. income tax returns are currently under examination by the IRS. The IRS has sought to disallow research credits in total of $2.5 million on the Company’s 2011, 2012 and 2013 U.S. income tax returns. The Company has exhausted all administrative appeals and formal mediation and has filed suit to resolve this dispute. The Company is awaiting a new court date to be set by the U.S. Tax Court for the 2011 through 2013 returns. The Company believes the research credits taken are appropriate and intends to vigorously defend its position. An amount of adjustment, if any, and the timing of such adjustment are not reasonably possible to estimate at this time. The total amount of research credits taken or expected to be taken in the Company’s income tax returns for 2011 through September 30, 2018 is approximately $10.0 million. Under the provisions of the ASC Subtopic 740-10-25, Income Taxes - Recognition, the Company had an unrecognized tax benefit of $3.4 million (inclusive of $0.3 million of interest) as of September 30, 2018. The Company’s effective tax rate was 25.3% and 25.0% for the three and nine months ended September 30, 2018 compared to 33.3% and 46.4% for the three and nine months ended September 30, 2017. The decrease in the effective tax rate is primarily due to the passage of the Tax Cuts and Jobs Act of 2017 (the “2017 Tax Act”), as well as the one-time tax impact of the determination in the second quarter of 2017 that the foreign earnings of the Company's Chinese subsidiary were no longer permanently reinvested. As of September 30, 2018, the Company’s net non-current deferred tax liability was $7.6 million. Deferred tax liabilities primarily relate to goodwill, other intangibles, fixed assets, prepaid expenses and issuance of the Notes. Net non-current deferred tax liabilities are recorded in “Other non-current liabilities” on the Condensed Consolidated Balance Sheet as of September 30, 2018 (unaudited) and December 31, 2017. In general, it is the Company’s practice and intention to reinvest the earnings of the Company’s foreign subsidiaries in those operations. However, during the second quarter of 2017, the Company determined that as a result of changes in the business and macroeconomic environment, the foreign earnings of the Company’s Chinese subsidiary were no longer permanently reinvested and may repatriate available earnings from time to time. A provision for the expected current and deferred taxes on the repatriation of earnings was recorded in the amount of $2.5 million during the second quarter of 2017. Approximately $1.6 million of this provision was reversed during the fourth quarter of 2017 due to the adoption of the 2017 Tax Act. Management intends to continue to permanently reinvest all other remaining current and prior earnings in its other foreign subsidiaries. Excluding China, foreign unremitted earnings of entities not included in the United States tax return have been included in the consolidated financial statements without giving effect to the United States taxes that may be payable on distribution to the United States because it is not anticipated such earnings will be remitted to the United States. Under current applicable tax laws, if the Company elects to remit some or all of the funds it has designated as indefinitely reinvested outside the United States, the amount remitted would be subject to non-U.S. withholding taxes. As of September 30, 2018, the aggregate unremitted earnings of the Company’s foreign subsidiaries for which a deferred income tax liability has not been recorded was approximately $8.7 million, and the unrecognized deferred tax liability on unremitted earnings was approximately $0.5 million. U.S. Tax Reform On December 22, 2017, the U.S. government enacted the 2017 Tax Act. The 2017 Tax Act significantly revised the ongoing U.S. corporate income tax by, among other things, lowering U.S. corporate income tax rates and implementing a territorial tax system. The SEC has issued rules that would allow for a measurement period of up to one year after the enactment date of the 2017 Tax Act to finalize the recording of the related tax impacts. Based on a continued analysis of the estimates and further guidance on the application of the law, it is anticipated that additional revisions may occur throughout the allowable measurement period. During the third quarter of 2018, the Company finalized and filed its 2017 income tax return. There were no material changes to the original estimate. The Company currently anticipates finalizing and recording any further adjustments within a year of the enactment date.

Income Taxes

The Company files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The Internal Revenue Service (the “IRS”) has completed examinations of the Company’s U.S. income tax returns or the statute of limitations has passed on returns for the years through 2010. The Company’s 2011 through 2015 U.S. income tax returns are currently under examination by the IRS. The IRS has sought to disallow research credits in total of $2.5 million on the Company’s 2011, 2012 and 2013 U.S. income tax returns. The Company has exhausted all administrative appeals and formal mediation and has filed suit to resolve this dispute. The Company is awaiting a new court date to be set by the U.S. Tax Court for the 2011 through 2013 returns. The Company believes the research credits taken are appropriate and intends to vigorously defend its position. An amount of adjustment, if any, and the timing of such adjustment are not reasonably possible to estimate at this time. The total amount of research credits taken or expected to be taken in the Company’s income tax returns for 2011 through September 30, 2018 is approximately $10.0 million.

Under the provisions of the ASC Subtopic 740-10-25, Income Taxes - Recognition, the Company had an unrecognized tax benefit of $3.4 million (inclusive of $0.3 million of interest) as of September 30, 2018.

The Company’s effective tax rate was 25.3% and 25.0% for the three and nine months ended September 30, 2018 compared to 33.3% and 46.4% for the three and nine months ended September 30, 2017. The decrease in the effective tax rate is primarily due to the passage of the Tax Cuts and Jobs Act of 2017 (the “2017 Tax Act”), as well as the one-time tax impact of the determination in the second quarter of 2017 that the foreign earnings of the Company's Chinese subsidiary were no longer permanently reinvested. As of September 30, 2018, the Company’s net non-current deferred tax liability was $7.6 million. Deferred tax liabilities primarily relate to goodwill, other intangibles, fixed assets, prepaid expenses and issuance of the Notes. Net non-current deferred tax liabilities are recorded in “Other non-current liabilities” on the Condensed Consolidated Balance Sheet as of September 30, 2018 (unaudited) and December 31, 2017.

In general, it is the Company’s practice and intention to reinvest the earnings of the Company’s foreign subsidiaries in those operations. However, during the second quarter of 2017, the Company determined that as a result of changes in the business and macroeconomic environment, the foreign earnings of the Company’s Chinese subsidiary were no longer permanently reinvested and may repatriate available earnings from time to time. A provision for the expected current and deferred taxes on the repatriation of earnings was recorded in the amount of $2.5 million during the second quarter of 2017. Approximately $1.6 million of this provision was reversed during the fourth quarter of 2017 due to the adoption of the 2017 Tax Act. Management intends to continue to permanently reinvest all other remaining current and prior earnings in its other foreign subsidiaries.

Excluding China, foreign unremitted earnings of entities not included in the United States tax return have been included in the consolidated financial statements without giving effect to the United States taxes that may be payable on distribution to the United States because it is not anticipated such earnings will be remitted to the United States. Under current applicable tax laws, if the Company elects to remit some or all of the funds it has designated as indefinitely reinvested outside the United States, the amount remitted would be subject to non-U.S. withholding taxes. As of September 30, 2018, the aggregate unremitted earnings of the Company’s foreign subsidiaries for which a deferred income tax liability has not been recorded was approximately $8.7 million, and the unrecognized deferred tax liability on unremitted earnings was approximately $0.5 million.

U.S. Tax Reform

On December 22, 2017, the U.S. government enacted the 2017 Tax Act. The 2017 Tax Act significantly revised the ongoing U.S. corporate income tax by, among other things, lowering U.S. corporate income tax rates and implementing a territorial tax system. The SEC has issued rules that would allow for a measurement period of up to one year after the enactment date of the 2017 Tax Act to finalize the recording of the related tax impacts. Based on a continued analysis of the estimates and further guidance on the application of the law, it is anticipated that additional revisions may occur throughout the allowable measurement period. During the third quarter of 2018, the Company finalized and filed its 2017 income tax return. There were no material changes to the original estimate. The Company currently anticipates finalizing and recording any further adjustments within a year of the enactment date.