The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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- Definition

Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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Property and Equipment (Details) (USD $)	3 Months Ended		6 Months Ended
Property and Equipment (Details) (USD $)	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 447,703,000		$ 447,703,000		$ 441,201,000
Accumulated depreciation and amortization	(254,404,000)		(254,404,000)		(269,480,000)
Property, Plant and Equipment, Net	193,299,000		193,299,000		171,721,000
Depreciation and Amortization	7,700,000	6,900,000	15,100,000	13,700,000
Land and land rights [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	23,157,000		23,157,000		23,157,000
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	149,216,000		149,216,000		148,323,000
Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	234,934,000		234,934,000		232,793,000
Office furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	23,897,000		23,897,000		23,440,000
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	11,313,000		11,313,000		7,652,000
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,186,000		$ 5,186,000		$ 5,836,000