Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 30, 2014
Components of accrued liabilities
Payroll and vacation	$ 17,700	$ 16,535
Accrued Real Estate and Personal Property Taxes, Current	6,045	5,528
Sales tax payable	4,683	4,978
Other	17,043	16,356
Total Accrued liabilities	$ 45,471	$ 43,397