Other Comprehensive Earnings (Loss), Tax Effects on Changes in Other Comprehensive Earnings (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Other Comprehensive Earnings (Loss) [Abstract]
Tax benefit on unrealized holding losses	$ 179	$ 445	$ 195	$ 315
Tax (expense) benefit on cash flow hedging activities	(73)	1,700	238	5,936
Tax benefit on changes in unrecognized pension and postretirement amounts	0	0	7,565	0
Reclassification Adjustment from AOCE, Tax expense (benefit) on cash flow hedging activities	1,015	(1,875)	107	(2,884)
Reclassification Adjustment from AOCE, Tax benefit on amortization of unrecognized pension and postretirement amounts	(600)	(822)	(1,857)	(2,466)
Other Comprehensive Income (Loss), Tax, Total	521	$ (552)	$ 6,248	$ 901
Cash Flow Hedge losses to be Reclassified within Twelve Months	$ 10,898