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Mortgage - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Mar. 24, 2016
Debt Instrument [Line Items]        
Repayments of secured debt $ 41,377,000 $ 9,523,000 $ 9,220,000  
Mortgage        
Debt Instrument [Line Items]        
Debt repayments of principal within the next twelve months 27,196,000      
Mortgage principal payment   $ 60,000,000    
Repayments of secured debt 32,800,000      
Repayments of principal in year two $ 55,000,000      
Mortgage interest rate       6.35%