Income Taxes (Details) - Reconciliation of the Expected Federal Income Taxes (Benefits) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Reconciliation of the Expected Federal Income Taxes (Benefits) [Abstract]
Expected federal income tax expense	$ 46,901	$ 47,650	$ 47,392
State income tax expense, net of federal effect	3,852	3,377	4,399
General business credits	(12,399)	(11,094)	(9,418)
Other, net	1,437	1,332	(1,021)
Total income tax expense	$ 39,791	$ 41,265	$ 41,352