Amortization Expense of Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 03, 2015	Mar. 28, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of sales	$ 1,119us-gaap_CostOfGoodsSoldAmortization	$ 1,301us-gaap_CostOfGoodsSoldAmortization
Amortization expense – operating expenses	1,889us-gaap_AmortizationOfIntangibleAssets	1,744us-gaap_AmortizationOfIntangibleAssets
Total amortization expense	$ 3,008	$ 3,045

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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