Income Taxes	6 Months Ended
Jul. 01, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate for the three months ended July 1, 2018 was 29.3%. For the three months ended July 2, 2017, the Company had a loss before income taxes of $297 and a provision for income taxes of $1,548; as such, our effective tax rate for the three months ended July 2, 2017 was not meaningful. The Company’s effective tax rate varies from the U.S. federal statutory rate of 21% and 35% in the second quarter of 2018 and 2017, respectively, primarily due to (1) state income taxes, (2) valuation allowance changes, net of federal benefit, (3) the impact of the comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), (4) net excess tax benefits related to share-based payments, which resulted in a benefit of $798 in the second quarter of 2018, and (5) the system optimization initiative provision of $2,166 in 2017, reflecting goodwill adjustments, changes to valuation allowances on state net operating loss carryforwards and state deferred taxes (including a correction to prior years identified and recorded in the second quarter of 2017, which resulted in a benefit of $2,248). The Company’s effective tax rate for the six months ended July 1, 2018 and July 2, 2017 was 11.6% and 35.6%, respectively. The Company’s effective tax rate varies from the U.S. federal statutory rate of 21% and 35% for the first six months of 2018 and 2017, respectively, primarily due to (1) net excess tax benefits related to share-based payments, which resulted in a benefit of $6,891 in the first six months of 2018, (2) state income taxes and (3) the impact of the Tax Act and (4) the system optimization initiative in 2017, reflecting goodwill adjustments, changes to valuation allowances on state net operating loss carryforwards and state deferred taxes (including a correction to prior years identified and recorded in the first six months of 2017, which resulted in a benefit of $2,248). On December 22, 2017, the U.S. government enacted the Tax Act. In our continued analysis of the impact of the Tax Act in the first and second quarters of 2018 under Staff Accounting Bulletin 118, we have adjusted our provisional amounts for a discrete net tax benefit of $2,795. This net benefit includes $4,750 for the tax benefit of foreign tax credits, partially offset by a net expense of $1,955 related to the impact of the corporate rate reduction on our net deferred tax liabilities. The ultimate impact of the Tax Act may differ from these provisional amounts, possibly materially, due to, among other things, additional analysis, changes in interpretations and assumptions the Company has made and additional regulatory guidance that may be issued. There were no significant changes to unrecognized tax benefits or related interest and penalties for the Company during the three and six months ended July 1, 2018. The current portion of refundable income taxes was $17,768 and $26,262 as of July 1, 2018 and December 31, 2017, respectively, and is included in “Accounts and notes receivable, net” in the condensed consolidated balance sheets. Long-term refundable income taxes are included in “Other assets” and amounted to $5,523 as of July 1, 2018. There were no long-term refundable income taxes as of December 31, 2017.

Income Taxes

The Company’s effective tax rate for the three months ended July 1, 2018 was 29.3%. For the three months ended July 2, 2017, the Company had a loss before income taxes of $297 and a provision for income taxes of $1,548; as such, our effective tax rate for the three months ended July 2, 2017 was not meaningful. The Company’s effective tax rate varies from the U.S. federal statutory rate of 21% and 35% in the second quarter of 2018 and 2017, respectively, primarily due to (1) state income taxes, (2) valuation allowance changes, net of federal benefit, (3) the impact of the comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), (4) net excess tax benefits related to share-based payments, which resulted in a benefit of $798 in the second quarter of 2018, and (5) the system optimization initiative provision of $2,166 in 2017, reflecting goodwill adjustments, changes to valuation allowances on state net operating loss carryforwards and state deferred taxes (including a correction to prior years identified and recorded in the second quarter of 2017, which resulted in a benefit of $2,248).

The Company’s effective tax rate for the six months ended July 1, 2018 and July 2, 2017 was 11.6% and 35.6%, respectively. The Company’s effective tax rate varies from the U.S. federal statutory rate of 21% and 35% for the first six months of 2018 and 2017, respectively, primarily due to (1) net excess tax benefits related to share-based payments, which resulted in a benefit of $6,891 in the first six months of 2018, (2) state income taxes and (3) the impact of the Tax Act and (4) the system optimization initiative in 2017, reflecting goodwill adjustments, changes to valuation allowances on state net operating loss carryforwards and state deferred taxes (including a correction to prior years identified and recorded in the first six months of 2017, which resulted in a benefit of $2,248).

On December 22, 2017, the U.S. government enacted the Tax Act. In our continued analysis of the impact of the Tax Act in the first and second quarters of 2018 under Staff Accounting Bulletin 118, we have adjusted our provisional amounts for a discrete net tax benefit of $2,795. This net benefit includes $4,750 for the tax benefit of foreign tax credits, partially offset by a net expense of $1,955 related to the impact of the corporate rate reduction on our net deferred tax liabilities. The ultimate impact of the Tax Act may differ from these provisional amounts, possibly materially, due to, among other things, additional analysis, changes in interpretations and assumptions the Company has made and additional regulatory guidance that may be issued.

There were no significant changes to unrecognized tax benefits or related interest and penalties for the Company during the three and six months ended July 1, 2018.

The current portion of refundable income taxes was $17,768 and $26,262 as of July 1, 2018 and December 31, 2017, respectively, and is included in “Accounts and notes receivable, net” in the condensed consolidated balance sheets. Long-term refundable income taxes are included in “Other assets” and amounted to $5,523 as of July 1, 2018. There were no long-term refundable income taxes as of December 31, 2017.