Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Components of net periodic benefit cost [Abstract]
Interest cost	$ 76	$ 83
Settlement loss recognized		21	$ 24,297
Other Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	76	83	91
Amortization of net loss	(112)	(92)	(85)
Settlement loss recognized	0	21	0
Net periodic benefit cost	$ 188	$ 196	$ 176