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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Leases [Abstract]      
Sale leaseback transactions, number 3 38 7
Proceeds from sale-leaseback transactions $ 4,257 $ 53,599 $ 9,148
Operating leases, term 20 years    
Sale leaseback transaction, deferred gains $ 716 1,480 16
Amortization of deferred gains from sale leaseback transactions $ 1,626 $ 1,788 $ 2,535