Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (406,934)		$ (406,934)		$ (383,415)
Net property, plant, and equipment	329,792		329,792		339,894
Depreciation	13,300	$ 13,100	38,988	$ 37,559
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	24,699		24,699		25,630
Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	106,062		106,062		114,636
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 605,965		$ 605,965		$ 583,043