Goodwill - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 610,831		$ 602,330
Accumulated Amortization	(241,540)		(229,686)
Net	369,291		372,644
Amortization of Intangible Assets	$ 11,930	$ 13,520
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life	11 years	11 years
Gross Carrying Amount	$ 482,084		475,050
Accumulated Amortization	(232,649)		(221,822)
Net	$ 249,435		253,228
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life	5 years	5 years
Gross Carrying Amount	$ 6,340		6,340
Accumulated Amortization	(4,596)		(4,311)
Net	$ 1,744		2,029
Amortizable Trade Name [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life	9 years	9 years
Gross Carrying Amount	$ 21,407		19,940
Accumulated Amortization	(4,295)		(3,553)
Net	17,112		16,387
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,000		101,000
Accumulated Amortization	0		0
Net	$ 101,000		$ 101,000

Finite And Indefinite Lived Intangible Assets Gross.

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- Definition

Finite And Indefinite Lived Intangible Assets [Line Items].

+ References

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification
-Topic 350
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-Paragraph 1
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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