Provision for Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for Income Taxes	Provision for Income Taxes The 2017 Tax Act was signed into law on December 22, 2017 and its provisions are generally effective for tax years beginning January 1, 2018. The most significant impacts of the 2017 Tax Act to the Company include a decrease in the federal corporate income tax rate from 35% to 21% and a one-time mandatory transition tax on deemed repatriation of previously tax-deferred and unremitted foreign earnings. On December 22, 2017, the SEC staff issued SAB 118 to provide guidance on accounting for the 2017 Tax Act’s impact. In accordance with SAB 118, the Company recognized the provisional tax impacts related to the remeasurement of its deferred income tax assets and liabilities and the one-time mandatory transition tax on deemed repatriation of unremitted foreign earnings in the three months ended December 30, 2017. In the first six months of 2018, the Company recorded an additional provisional net income tax expense of $792,000, which included the impact of state taxes for the one-time mandatory transition tax, primarily due to a 2018 tax law change associated with the 2017 Tax Act that impacted the provisional amount initially recorded. Additional work is still necessary to finalize the provisional tax impacts of the 2017 Tax Act, including the completion of a more detailed analysis of the Company’s historical foreign earnings and the understanding and application of anticipated additional regulatory guidance regarding the provisions of the 2017 Tax Act that may be issued by the Internal Revenue Service and state and local jurisdictions. Any subsequent adjustment to the provisional amounts will be recorded to current tax expense in the quarter of 2018 in which the analysis is complete. The provision for income taxes was $9,132,000 in the first six months of 2018 and $5,690,000 in the first six months of 2017. The effective tax rate of 28% in the first six months of 2018 was higher than the Company's 2018 statutory tax rate of 21% primarily due to the global intangible low-taxed income (GILTI) provisions of the 2017 Tax Act, the distribution of the Company's worldwide earnings, and a change in estimate to the federal and state provisional net income tax expense initially recorded in 2017 for the 2017 Tax Act. This incremental tax expense was offset in part by a decrease in tax related to the net excess income tax benefits from stock-based compensation arrangements, the release of tax reserves, and a change in estimate for foreign income tax that the Company had previously accrued on certain distributed earnings. With the enactment of the 2017 Tax Act, the Company is now providing for the cost of repatriating the earnings of certain foreign subsidiaries on a recurring basis, resulting in $426,000 of incremental tax expense in the first six months of 2018. The effective tax rate of 25% in the first six months of 2017 was lower than the Company's 2017 statutory tax rate of 35% primarily due to the distribution of the Company's worldwide earnings and the net excess income tax benefits from stock-based compensation arrangements, offset in part by an increase in tax related to non-deductible expenses and unrecognized tax benefits. The Company has elected to account for GILTI as a current period expense when incurred (the period cost method). Because of the complexity of the GILTI tax rules and the lack of legislative guidance, the Company continues to evaluate the provisions of the 2017 Tax Act and the application of ASC 740, Income Taxes. The final impact on the Company from the 2017 Tax Act’s GILTI tax legislation may differ from the estimate calculated by the Company. Such differences could be material, due to, among other things, changes in interpretations of the 2017 Tax Act, future legislative action to address questions that arise because of the 2017 Tax Act, changes in accounting standards for income taxes or related interpretations in response to the 2017 Tax Act, or any updates or changes to estimates the Company has utilized to calculate the GILTI inclusion.

Provision for Income Taxes

The 2017 Tax Act was signed into law on December 22, 2017 and its provisions are generally effective for tax years beginning January 1, 2018. The most significant impacts of the 2017 Tax Act to the Company include a decrease in the federal corporate income tax rate from 35% to 21% and a one-time mandatory transition tax on deemed repatriation of previously tax-deferred and unremitted foreign earnings. On December 22, 2017, the SEC staff issued SAB 118 to provide guidance on accounting for the 2017 Tax Act’s impact. In accordance with SAB 118, the Company recognized the provisional tax impacts related to the remeasurement of its deferred income tax assets and liabilities and the one-time mandatory transition tax on deemed repatriation of unremitted foreign earnings in the three months ended December 30, 2017. In the first six months of 2018, the Company recorded an additional provisional net income tax expense of $792,000, which included the impact of state taxes for the one-time mandatory transition tax, primarily due to a 2018 tax law change associated with the 2017 Tax Act that impacted the provisional amount initially recorded.

Additional work is still necessary to finalize the provisional tax impacts of the 2017 Tax Act, including the completion of a more detailed analysis of the Company’s historical foreign earnings and the understanding and application of anticipated additional regulatory guidance regarding the provisions of the 2017 Tax Act that may be issued by the Internal Revenue Service and state and local jurisdictions. Any subsequent adjustment to the provisional amounts will be recorded to current tax expense in the quarter of 2018 in which the analysis is complete.

The provision for income taxes was $9,132,000 in the first six months of 2018 and $5,690,000 in the first six months of 2017. The effective tax rate of 28% in the first six months of 2018 was higher than the Company's 2018 statutory tax rate of 21% primarily due to the global intangible low-taxed income (GILTI) provisions of the 2017 Tax Act, the distribution of the Company's worldwide earnings, and a change in estimate to the federal and state provisional net income tax expense initially recorded in 2017 for the 2017 Tax Act. This incremental tax expense was offset in part by a decrease in tax related to the net excess income tax benefits from stock-based compensation arrangements, the release of tax reserves, and a change in estimate for foreign income tax that the Company had previously accrued on certain distributed earnings. With the enactment of the 2017 Tax Act, the Company is now providing for the cost of repatriating the earnings of certain foreign subsidiaries on a recurring basis, resulting in $426,000 of incremental tax expense in the first six months of 2018. The effective tax rate of 25% in the first six months of 2017 was lower than the Company's 2017 statutory tax rate of 35% primarily due to the distribution of the Company's worldwide earnings and the net excess income tax benefits from stock-based compensation arrangements, offset in part by an increase in tax related to non-deductible expenses and unrecognized tax benefits.

The Company has elected to account for GILTI as a current period expense when incurred (the period cost method). Because of the complexity of the GILTI tax rules and the lack of legislative guidance, the Company continues to evaluate the provisions of the 2017 Tax Act and the application of ASC 740, Income Taxes. The final impact on the Company from the 2017 Tax Act’s GILTI tax legislation may differ from the estimate calculated by the Company. Such differences could be material, due to, among other things, changes in interpretations of the 2017 Tax Act, future legislative action to address questions that arise because of the 2017 Tax Act, changes in accounting standards for income taxes or related interpretations in response to the 2017 Tax Act, or any updates or changes to estimates the Company has utilized to calculate the GILTI inclusion.