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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization $ 6,476 $ 7,846  
Accumulated amortization 5,968 4,998  
Amortization Expense      
2020 1,368    
2021 927    
2022 827    
2023 822    
2024 822    
Thereafter 1,710    
Total 6,476    
Amortization of expenses related to intangible assets 1,400 1,400 $ 1,500
Non-competition agreements      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 119 180  
Accumulated amortization 205 544  
Customer relationships      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 6,357 7,666  
Accumulated amortization $ 5,763 $ 4,454