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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Leases [Abstract]      
Sale leaseback transactions, number 5 3 38
Proceeds from sale-leaseback transactions $ 8,424 $ 4,257 $ 53,599
Operating leases, term 20 years    
Sale leaseback transaction, deferred gains $ 206 716 1,480
Amortization of deferred gains from sale leaseback transactions $ 1,584 $ 1,626 $ 1,788