Employee Benefit Plans (Change in Benefit Obligation and Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2019	Dec. 26, 2018	Dec. 27, 2017
Change in Benefit Obligation:
Benefit obligation at beginning of year	$ 2,393	$ 2,608
Interest cost	81	76	$ 83
Actuarial losses (gains)	25	(96)
Benefits paid	(162)	(195)
Benefit obligation at end of year	2,337	2,393	2,608
Accumulated benefit obligation	2,337	2,393
Change in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Employer contributions	162	195
Benefits paid	(162)	(195)
Fair value of plan assets at end of year	0	0	$ 0
Unfunded status at end of year	(2,337)	(2,393)
Amounts recognized on the balance sheet:
Other current liabilities	(662)	(584)
Other noncurrent liabilities	(1,675)	(1,809)
Net amount recognized	(2,337)	(2,393)
Amounts in accumulated other comprehensive loss not yet reflected in net period benefit cost:
Unamortized actuarial losses, net	(823)	(885)
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:
Benefit obligation actuarial (loss) gain	(25)	96
Amortization of net loss	86	112
Other comprehensive income	$ 61	$ 208