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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization $ 7,846 $ 9,208  
Accumulated amortization 4,998 3,636  
Amortization Expense      
2019 1,370    
2020 1,368    
2021 927    
2022 827    
2023 822    
Thereafter 2,532    
Total 7,846    
Amortization of expenses related to intangible assets 1,400 1,500 $ 900
Non-compete agreements      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 180 260  
Accumulated amortization 544 464  
Customer relationships      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 7,666 8,948  
Accumulated amortization $ 4,454 $ 3,172