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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Other Liabilities Disclosure [Abstract]    
Employee benefits $ 7,750 $ 2,169
Insurance reserves and retention 3,239 4,070
State income taxes payable 3,230 14
Property, sales, and other non-income taxes payable 5,270 3,226
Accrued interest and other 2,416 1,293
Total 21,905 10,772
Current portion of cash-settled Stock Appreciation Rights $ 6,600  
401K Employer matching contribution accrued liability   $ 1,000