Acquisition and Divestiture Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Dec. 31, 2015
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Goodwill	$ 142,183	$ 138,244
Sonntag [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquisition of business, net of cash acquired	$ 5,450
Business Acquisition, Name of Acquired Entity	Sonntag Electronic GmbH
Business Acquisition, Effective Date of Acquisition	Jan. 01, 2016
Goodwill related to acquisitions	$ 3,485
Gross purchase price of acquired business		$ 6,750