Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2017	Dec. 29, 2016
Change in benefit obligation:
Benefit obligation at beginning of period	$ 32,523	$ 31,671
Service cost	765	865
Interest cost	1,356	1,406
Actuarial loss	4,244	82
Curtailment	0	(261)
Benefits paid	(1,249)	(1,240)
Benefit obligation at end of year	37,639	32,523
Amounts recognized in the statement of financial position consist of:
Current accrued benefit liability (included in Other accrued liabilities)	(1,347)	(1,252)
Noncurrent accrued benefit liability (included in Deferred compensation and other)	(36,292)	(31,271)
Total	(37,639)	(32,523)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	12,874	9,049
Prior service credit	(579)	(642)
Total	$ 12,295	$ 8,407