Goodwill and Acquired Intangibles (Details 2) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Amortization of acquired intangibles
Cost of product and maintenance	$ 12,232	$ 11,484	$ 24,000	$ 22,344
Amortization of acquired intangibles	5,030	4,590	9,661	8,796
Total amortization of acquired intangibles	$ 17,262	$ 16,074	$ 33,661	$ 31,140

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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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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