Other Comprehensive Earnings (Loss), Reclassification From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 25,072	$ 24,305	$ 73,752	$ 72,263
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) On Derivative Instruments [Member] | Interest Rate Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 450	$ 450	$ 1,384	$ 1,349