Other Intangible Assets - Summary of Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014	Dec. 31, 2014
Other Intangible Assets
Gross Carrying Amount	$ 74,393		$ 74,393
Accumulated Amortization	(39,464)		(38,491)
Total amortization expense	34,929us-gaap_FiniteLivedIntangibleAssetsNet		35,902us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense	973us-gaap_AmortizationOfIntangibleAssets	1,034us-gaap_AmortizationOfIntangibleAssets
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	51,804		51,804
Accumulated Amortization	(25,082)		(24,415)
Total amortization expense	26,722		27,389
Patents
Other Intangible Assets
Gross Carrying Amount	10,319		10,319
Accumulated Amortization	(10,319)		(10,319)
Other intangibles
Other Intangible Assets
Gross Carrying Amount	12,270		12,270
Accumulated Amortization	(4,063)		(3,757)
Total amortization expense	$ 8,207		$ 8,513

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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