Employee Benefit Plans (Change in Benefit Obligation and Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,608	$ 2,639
Interest cost	76	83
Actuarial (gains) losses	(96)	172
Benefits paid	(195)	(195)
Settlements	0	(91)
Benefit obligation at end of year	2,393	2,608	$ 2,639
Accumulated benefit obligation	2,393	2,608
Change in Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Employer contributions	195	286
Benefits paid	(195)	(195)
Settlements	0	(91)
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(2,393)	(2,608)
Other current liabilities	(584)	(280)
Other noncurrent liabilities	(1,809)	(2,328)
Net amount recognized	(2,393)	(2,608)
Unamortized actuarial losses, net	(885)	(1,093)
Benefit obligation actuarial gain (loss)	96	(172)	$ (603)
Amortization of net loss	112	92
Settlement loss recognized	0	21
Other comprehensive income (loss)	$ 208	$ (59)