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Favorable and Unfavorable Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Leases, Acquired-in-Place, Market Adjustment [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 200 $ 200 $ 700 $ 600
Amortization Expense, Expected Full Year 800   800  
Next Fiscal Year 900   900  
Second Fiscal Year 800   800  
Third Fiscal Year 700   700  
Fourth Fiscal Year 600   600  
Fifth Fiscal Year 600   600  
2017 Acquisitions [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Favorable leases 1,100   1,100  
Unfavorable leases $ 2,997   $ 2,997