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Goodwill and Acquired Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Amortization of acquired intangibles
Cost of product	$ 3,605	$ 2,906	$ 9,395	$ 7,585
Cost of maintenance	269	0	269	0
Amortization of acquired intangibles	3,876	3,786	11,305	12,750
Total amortization of acquired intangibles	$ 7,750	$ 6,692	$ 20,969	$ 20,335

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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