Employee Benefit Plans (Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets, Other Postretirement Benefit Plans) (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 17,374	$ 15,453
Realized gains (losses)	(1,621)	741	$ 539
Fair value of plan assets at end of year	16,279	17,374	15,453
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	1,151
Fair value of plan assets at end of year	1,176	1,151
Multi-strategy hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	1,151
Fair value of plan assets at end of year	1,176	1,151
Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement		(562)
Fair value of plan assets at beginning of year	1,151	1,508	1,374
Realized gains (losses)		229
Unrealized gains (losses)	25	(24)	134
Fair value of plan assets at end of year	$ 1,176	$ 1,151	$ 1,508