Dispositions Dispositions (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative translation adjustment in loss (gain) on disposal of subsidiary		$ 0	$ 0	$ 212,000	$ (1,431,000)
Gain on disposal of subsidiaries		0	5,144,000	(212,000)	6,575,000
Income tax expense (benefit)		$ 5,989,000	6,526,000	13,242,000	15,591,000
Hungary
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative translation adjustment in loss (gain) on disposal of subsidiary				$ 200,000
Africa
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of equity interest	$ 15,100,000
Cost method investments	0
Gain on disposal of subsidiaries			$ 5,100,000		5,100,000
Romania
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative translation adjustment in loss (gain) on disposal of subsidiary					$ 1,400,000
Other Foreign | Africa
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense (benefit)	$ 700,000