Policies (Details)	6 Months Ended
Jun. 30, 2020
Interim Statement Presentation [Line Items]
Basis of Accounting, Policy [Policy Text Block]	The condensed consolidated financial statements were prepared using GAAP
Use of Estimates, Policy [Policy Text Block]	These principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses
Fiscal Period, Policy [Policy Text Block]	Prior to fiscal year 2020, our second fiscal quarter ended on the Saturday closest to June 30. The second quarter and year-to-date periods for 2019 presented herein consisted of 91 days and 182 days, respectively, and ended on June 29, 2019. In December 2019, our Board of Directors approved the change of our fiscal year to a calendar year, commencing with fiscal year 2020. Accordingly, the second quarter and year-to-date periods for 2020 presented herein consisted of 91 days and 185 days, respectively, and ended on June 30, 2020. All references to periods in these notes to condensed consolidated financial statements represent the respective periods described above ending on June 30, 2020 and June 29, 2019, unless otherwise noted.
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides optional financial reporting alternatives to reduce the cost and complexity associated with the accounting for contracts and hedging relationships affected by reference rate reform, such as the upcoming discontinuance of the London Interbank Offered Rate ("LIBOR"). The accommodations within ASU 2020-04 may be applied prospectively from the beginning of our 2020 first quarter through December 31, 2022. We are currently evaluating the effect that ASU 2020-04 may have on our contracts that reference LIBOR, specifically, our Third Amended and Restated Credit Agreement (as amended, the "Credit Agreement") and related interest rate swap. As of the date of this filing, we have not elected to apply any of the provisions of this standard.
Accounting Standards Update 2018-18 [Member]
Interim Statement Presentation [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In November 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606, which clarifies when transactions between participants in a collaborative arrangement are within the scope of the FASB's recent revenue standard (Topic 606). Such guidance clarifies revenue recognition and financial statement presentation for transactions between collaboration participants. We adopted ASU 2018-18 in the first quarter of 2020. Such guidance did not have an impact on our consolidated financial statements and related disclosures.

Policies (Details)

6 Months Ended

Jun. 30, 2020

Interim Statement Presentation [Line Items]

Basis of Accounting, Policy [Policy Text Block]

The condensed consolidated financial statements were prepared using GAAP

Use of Estimates, Policy [Policy Text Block]

These principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses

Fiscal Period, Policy [Policy Text Block]

Prior to fiscal year 2020, our second fiscal quarter ended on the Saturday closest to June 30. The second quarter and year-to-date periods for 2019 presented herein consisted of 91 days and 182 days, respectively, and ended on June 29, 2019.

In December 2019, our Board of Directors approved the change of our fiscal year to a calendar year, commencing with fiscal year 2020. Accordingly, the second quarter and year-to-date periods for 2020 presented herein consisted of 91 days and 185 days, respectively, and ended on June 30, 2020.

All references to periods in these notes to condensed consolidated financial statements represent the respective periods described above ending on June 30, 2020 and June 29, 2019, unless otherwise noted.

Description of New Accounting Pronouncements Not yet Adopted [Text Block]

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides optional financial reporting alternatives to reduce the cost and complexity associated with the accounting for contracts and hedging relationships affected by reference rate reform, such as the upcoming discontinuance of the London Interbank Offered Rate ("LIBOR"). The accommodations within ASU 2020-04 may be applied prospectively from the beginning of our 2020 first quarter through December 31, 2022. We are currently evaluating the effect that ASU 2020-04 may have on our contracts that reference LIBOR, specifically, our Third Amended and Restated Credit Agreement (as amended, the "Credit Agreement") and related interest rate swap. As of the date of this filing, we have not elected to apply any of the provisions of this standard.

Accounting Standards Update 2018-18 [Member]

Interim Statement Presentation [Line Items]

New Accounting Pronouncement or Change in Accounting Principle, Description

In November 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606, which clarifies when transactions between participants in a collaborative arrangement are within the scope of the FASB's recent revenue standard (Topic 606). Such guidance clarifies revenue recognition and financial statement presentation for transactions between collaboration participants. We adopted ASU 2018-18 in the first quarter of 2020. Such guidance did not have an impact on our consolidated financial statements and related disclosures.