Segment Information - Reconciliation of Net Income to EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting, Other Significant Reconciling Item, Consolidated
Net income	$ 17,042	$ 28,637	$ 55,175	$ 103,817
Equity earnings in non-consolidated entities	0	0	0	(738)
Income tax expense (benefit)	22,500	(31,686)	45,030	(13,141)
Depreciation and amortization	34,921	31,248	99,749	90,279
Interest expense, net	17,571	18,341	53,719	51,832
Impairment and restructuring charges	7,935	3,891	17,388	9,378
Gain on previously held shares of an equity investment	0	0	0	(20,767)
Loss (gain) on sale of property and equipment	1	(119)	1,081	154
Stock-based compensation	4,108	4,133	10,585	12,374
Non-cash foreign exchange transaction/translation (income) loss	(182)	2,840	3,615	(359)
Other items	5,052	75,154	38,732	107,868
Other non-cash items	0	0	734	12,191
Costs relating to debt restructuring and debt refinancing	0	190	0	265
Adjusted EBITDA	$ 108,948	$ 132,629	$ 325,808	$ 353,153