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Acquisition Activities (Details) - USD ($) $ in Thousands		3 Months Ended
Acquisition Activities (Details) - USD ($) $ in Thousands	Jan. 03, 2019	Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018
Acquisition Activities [Abstract]
Acquisition of business, net of cash acquired		$ 11,862	$ 12,072
Goodwill related to acquisitions		$ 150,628		$ 147,480
Bi-Metallix [Member]
Acquisition Activities [Abstract]
Purchase price of businesses	$ 11,862
Finite-lived Intangible Assets Acquired	2,900
Goodwill related to acquisitions	$ 3,324
Business Acquisition, Name of Acquired Entity	Bi-Metallix, Inc.
Business Acquisition, Effective Date of Acquisition		Jan. 03, 2019