Change in Gross Goodwill and Intangibles.

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Intangible Assets Gross (Including Goodwill).

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Intangible Assets Including Goodwill, Finite-lived and Indefinite-lived Intangibles [Line Items].

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Intangible Assets Net (Including Goodwill).

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The useful life of all finite-lived intangible assets.

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The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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Carrying amount of intangible assets, excluding goodwill, which have a projected indefinite period of benefit (hence are not amortized), allocated to the reportable segment. These assets, acquired either individually or as part of a group of assets, in either an asset acquisition or business combination, are assessed at least annually for impairment. Examples may include trade secrets, contractual rights, trade names, and licensing agreements.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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Goodwill and Other Acquisition-Related Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010	Dec. 31, 2010
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill Gross	$ 3,376		$ 3,376		$ 3,376
Goodwill, Impairment Loss			0
Goodwill	3,376		3,376		3,376
Finite-Lived Intangible Assets, Gross	50,503		50,503		48,653
Finite-Lived Intangible Assets, Accumulated Amortization	(25,605)		(25,605)		(22,597)
Finite-Lived Intangible Assets, Net	24,898		24,898		26,056
Intangible Assets Gross Including Goodwill	54,994		54,994		53,394
Intangible Assets Net Including Goodwill	29,389		29,389		30,797
Amortization of Intangible Assets	1,511	1,492	3,008	2,978
Change in Gross Goodwill and Intangible Assets			1,600
In Process Research And Development [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	850		850		600
Finite-Lived Intangible Assets, Accumulated Amortization	(153)		(153)		(50)
Finite-Lived Intangible Assets, Net	697		697		550
Change in Gross Goodwill and Intangible Assets			250
Finite-Lived Intangible Assets, Useful Life (years)			3
Intangible asset amortization period - minimum (in years)			3
Intangible asset amortization period - maximum (in years)			5
Patents Trademarks And Other [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	49,653		49,653		48,053
Finite-Lived Intangible Assets, Accumulated Amortization	(25,452)		(25,452)		(22,547)
Finite-Lived Intangible Assets, Net	24,201		24,201		25,506
Change in Gross Goodwill and Intangible Assets			1,600
Intangible asset amortization period - minimum (in years)			2
Intangible asset amortization period - maximum (in years)			15
Goodwill [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Change in Gross Goodwill and Intangible Assets			0
In Process Research And Development Non Amortizing [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	1,115		1,115		1,365
Change in Gross Goodwill and Intangible Assets			(250)
Patents [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life (years)	11
Payments to Acquire Intangible Assets	$ 1,600