Acquisition Additional Acquisition (Details) - USD ($) $ in Thousands				3 Months Ended	6 Months Ended
	Jun. 26, 2018	Jun. 25, 2018	Jan. 22, 2018	Jun. 30, 2018	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Total Purchase Price					$ 380,225	$ 20,000
Goodwill				$ 529,933	529,933		$ 359,688
SPG
Business Acquisition [Line Items]
Inventory		$ 46,073
Inventory fair value step-up		$ 10,200
Amortization of Inventory Step-up				200	200
Business Acquisition, Date of Acquisition Agreement		Jun. 25, 2018
Total Purchase Price		$ 352,500
Goodwill		$ 162,251
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		13 years 10 months
Identifiable Intangible Assets		$ 178,220
Payments to Acquire Businesses, Net of Cash Acquired		$ 341,200
Business Acquisition, Transaction Costs				$ 4,800	$ 4,800
PSS
Business Acquisition [Line Items]
Inventory			$ 1,827
Business Acquisition, Date of Acquisition Agreement			Jan. 22, 2018
Total Purchase Price			$ 37,297
Goodwill			$ 8,820
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years 5 months
Identifiable Intangible Assets			$ 25,600
Flex
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement	Jun. 26, 2018
Total Purchase Price	$ 1,900
Customer Relationships [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Identifiable Intangible Assets		$ 148,200
Technology-Based Intangible Assets [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 years
Identifiable Intangible Assets		$ 17,900
Trade Names [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Identifiable Intangible Assets		$ 6,700
Other Intangible Assets [Member] | SPG
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year
Identifiable Intangible Assets		$ 5,500