This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Segment and Geographic Data (Operating Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Unallocated selling, general, and administrative expenses									$ (79,622)	$ (80,935)	$ (73,751)
Acquisition costs	$ (443)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	(443)	0	0
Impairment of goodwill and indefinite-lived intangibles	0	0	0	0	(2,820)	0	0	0	0	(2,820)	0
Executive severance costs	0	0	(611)	0	0	0	0	0	(611)	0	0
Restructuring costs									(2,293)	(289)	(2,044)
Operating income	$ 1,757	$ 6,186	$ 8,102	$ 12,603	$ 7,091	$ 10,631	$ 11,315	$ 8,186	28,648	37,223	22,488
Corporate/ Other
Segment Reporting Information [Line Items]
Unallocated selling, general, and administrative expenses									(27,579)	(29,094)	(25,938)
Acquisition costs									0
Impairment of goodwill and indefinite-lived intangibles										0
Executive severance costs									(611)
Operating income									$ (30,926)	$ (32,203)	$ (27,982)