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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Acquired identifiable intangible assets    
Total cost $ 12,444 $ 12,444
Accumulated amortization (6,311) (5,968)
Total intangible assets, net 6,133 6,476
Non-competition agreements    
Acquired identifiable intangible assets    
Total cost 324 324
Customer relationships    
Acquired identifiable intangible assets    
Total cost $ 12,120 $ 12,120