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Goodwill and Acquired Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Amortization of acquired intangibles
Cost of product and maintenance	$ 5,760	$ 2,891	$ 9,567	$ 5,790
Amortization of Intangible Assets	5,327	3,643	9,118	7,429
Total amortization of acquired intangibles	$ 11,087	$ 6,534	$ 18,685	$ 13,219

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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