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Accounting Policies (Policies)	9 Months Ended
Accounting Policies (Policies)	Oct. 01, 2017
Accounting Policies
Estimates	Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Shipping and Handling	Shipping and Handling Shipping and handling costs included in selling, general and administrative expense amounted to $12.8 million and $12.7 million for the third quarters of 2017 and 2016, respectively,
Research and Development	Research and Development Research and development costs included in selling, general, and administrative expense amounted to $7.3 million and $6.6 million for the third quarters of 2017 and 2016, respectively

Disclosure of accounting policy for the classification of shipping and handling costs, including whether the costs are included in cost of sales or included in other income statement accounts. If shipping and handling fees are significant and are not included in cost of sales, disclosure includes both the amounts of such costs and the line item on the income statement which includes such costs.

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