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Goodwill and Acquired Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Amortization of acquired intangibles
Cost of product and maintenance	$ 3,807	$ 2,899
Amortization of Intangible Assets	3,791	3,786
Total amortization of acquired intangibles	$ 7,598	$ 6,685

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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