Goodwill and Other Intangible Assets, Net - Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 195,968	$ 197,603
Accumulated Amortization	(86,970)	(80,485)
Customer lists / relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	158,412	159,592
Accumulated Amortization	(70,756)	(65,036)
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross Amount	19,899	20,148
Accumulated Amortization	(3,394)	(2,790)
Trademarks / trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	8,847	8,995
Accumulated Amortization	(4,115)	(3,905)
Non-compete agreements and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	8,287	8,345
Accumulated Amortization	$ (8,265)	(8,319)
Patents
Finite-Lived Intangible Assets [Line Items]
Amortization Period	17 years
Gross Amount	$ 523	523
Accumulated Amortization	$ (440)	$ (435)
Minimum | Customer lists / relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	6 years
Minimum | Developed technologies
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years
Minimum | Trademarks / trade names
Finite-Lived Intangible Assets [Line Items]
Amortization Period	3 years
Minimum | Non-compete agreements and other
Finite-Lived Intangible Assets [Line Items]
Amortization Period	1 year
Maximum | Customer lists / relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	26 years
Maximum | Developed technologies
Finite-Lived Intangible Assets [Line Items]
Amortization Period	20 years
Maximum | Trademarks / trade names
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years
Maximum | Non-compete agreements and other
Finite-Lived Intangible Assets [Line Items]
Amortization Period	9 years