Income Taxes (Reconciliation of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Taxes [Abstract]
Income taxes at federal statutory rate	$ 43,631	$ 32,316	$ 29,282
State income taxes, net of federal income tax benefit	2,413	1,112	1,436
Deferred tax on gain on bargain purchase	(8,358)	0	0
Other	(187)	(427)	(1,437)
Provision for income taxes	$ 37,499	$ 33,001	$ 29,281
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent	30.10%	35.70%	35.00%