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Goodwill and Acquired Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Amortization of acquired intangibles
Cost of product	$ 2,899	$ 2,196
Amortization of acquired intangibles	3,786	4,459
Total acquired intangibles	$ 6,685	$ 6,655

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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