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Goodwill and Acquired Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Amortization of acquired intangibles
Cost of product	$ 13,003	$ 10,480	$ 5,603
Cost of maintenance	538	0	1,045
Amortization of acquired intangibles	15,077	16,536	14,160
Total amortization of acquired intangibles	$ 28,618	$ 27,016	$ 20,808

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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