Annual report pursuant to Section 13 and 15(d)

Operating Leases (Narrative) (Details)

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Operating Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Operating Leases [Abstract]      
Rent expense $ 9,586 $ 11,240 $ 10,931