Employee Benefit Plans (Schedule of Net Benefit Costs, Pension Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment			$ (816)
Service cost	$ 4,951	$ 4,337	4,332
Interest cost	16,707	18,638	20,696
Expected return on plan assets	(26,401)	(24,245)	(26,021)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0	0	907
Actuarial loss (gain)	(7,085)	15,890	12,953
Amortization of prior service cost	(195)	(210)	(238)
Net periodic benefit cost	$ (12,023)	$ 14,410	10,815
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)			$ 821