Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Taxes [Abstract]
Current Federal Income Tax Expense (Benefit)	$ 25,908	$ 29,888	$ 24,809
Current State Income Tax Expense (Benefit)	5,888	3,325	1,237
Deferred Federal Income Tax Expense (Benefit)	6,020	(188)	2,559
Deferred State Income Tax Expense (Benefit)	(317)	(24)	676
Provision for income taxes	$ 37,499	$ 33,001	$ 29,281