Basis of Presentation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 15,265,000	$ 16,644,000	$ 35,393,000	$ 29,967,000
Basic and diluted earnings per share	$ 0.57	$ 0.62	$ 1.32	$ 1.12
Adjustment [Member] | Self-Insurance Error Correction [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income		$ 214,000		$ 428,000
Basic and diluted earnings per share		$ 0.01		$ 0.02