Provision for Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Provision for Income Taxes	Provision for Income Taxes The Tax Cuts and Jobs Act of 2017 (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 re-measurement 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 quarter of 2018, the Company recorded an additional provisional net income tax expense of $787,000, including 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 $3,861,000 in the first three months of 2018 and $2,735,000 in the first three months of 2017. The effective tax rate of 26% in the first three months of 2018 was higher than the Company's 2018 statutory tax rate of 21% primarily due to a true-up to the federal provisional net income tax expense initially recorded in 2017 for the 2017 Tax Act, the U.S. tax cost of foreign operations, including the global intangible low-taxed income provisions of the 2017 Tax Act, and the distribution of the Company's worldwide earnings. 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 favorable impact to state taxes primarily related to the true-up to the provisional net income tax expense initially recorded in 2017 for the 2017 Tax Act. The effective tax rate of 23% in the first three 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.

Provision for Income Taxes

The Tax Cuts and Jobs Act of 2017 (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 re-measurement 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 quarter of 2018, the Company recorded an additional provisional net income tax expense of $787,000, including 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 $3,861,000 in the first three months of 2018 and $2,735,000 in the first three months of 2017. The effective tax rate of 26% in the first three months of 2018 was higher than the Company's 2018 statutory tax rate of 21% primarily due to a true-up to the federal provisional net income tax expense initially recorded in 2017 for the 2017 Tax Act, the U.S. tax cost of foreign operations, including the global intangible low-taxed income provisions of the 2017 Tax Act, and the distribution of the Company's worldwide earnings. 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 favorable impact to state taxes primarily related to the true-up to the provisional net income tax expense initially recorded in 2017 for the 2017 Tax Act. The effective tax rate of 23% in the first three 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.