Segment Reporting (Depreciation and Amortization by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 47,926	$ 50,571	$ 147,196	$ 151,473
Operating segments [Member] | U.S. segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	36,670	39,796	114,372	119,063
Operating segments [Member] | International segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	7,201	6,420	20,406	19,866
Corporate, non-segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 4,055	$ 4,355	$ 12,418	$ 12,544