Segment Reporting (Depreciation and Amortization by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 50,782	$ 48,063	$ 100,902	$ 94,653
Operating segments [Member] | U.S. segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	39,993	37,406	79,267	74,006
Operating segments [Member] | International segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	6,714	7,014	13,446	13,514
Corporate, non-segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 4,075	$ 3,643	$ 8,189	$ 7,133