Long-Term Debt (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($) item	Jul. 01, 2014 USD ($)	Oct. 16, 2013 USD ($)
Long-term debt
Maximum commitments				$ 200,000
Maximum commitments, letter of credit sub facility				50,000
Additional available credit				$ 100,000
Available borrowings		$ 152,300
Outstanding borrowings		25,000
Outstanding letters of credit		22,700
Borrowings on credit facility	$ 25,000	$ 25,000	$ 25,000
Multiplier of rent used to compute Adjusted Debt | item		8
Threshold amount of unrestricted cash and cash equivalents above which amounts are netted against debt for calculation of net adjusted leverage ratio		$ 25,000
Trailing period for which EBITDAR is computed		12 months
Net Adjusted Leverage Ratio		2.6
EBITDAR Ratio		2.9
Minimum
Long-term debt
Financial covenant, EBITDAR Ratio		1.9
Commitment fee (as a percent)		0.15%
Maximum
Long-term debt
Financial covenant, EBITDAR Ratio		4.0
Commitment fee (as a percent)		0.30%
Adjusted LIBO Rate
Long-term debt
Credit facility, floating interest rate basis		Adjusted LIBO Rate
Adjusted LIBO Rate | Minimum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)		1.00%
Adjusted LIBO Rate | Maximum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)		1.75%
Federal Funds Effective Rate
Long-term debt
Credit facility, floating interest rate basis		Federal Funds Effective Rate
Credit facility, basis spread on variable rate, (as a percent)		0.50%
One-month Adjusted LIBO Rate
Long-term debt
Credit facility, floating interest rate basis		one-month Adjusted LIBO Rate
Fixed percentage added to variable rate		1.00%
One-month Adjusted LIBO Rate | Minimum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)		0.00%
One-month Adjusted LIBO Rate | Maximum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)		0.75%