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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization $ 9,208 $ 2,685  
Accumulated amortization 3,636 9,002  
Amortization Expense      
2018 1,383    
2019 1,365    
2020 1,388    
2021 921    
2022 823    
Thereafter 3,328    
Total 9,208    
Amortization of intangible assets 1,500 900 $ 1,000
Non-competition agreements      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 260 80  
Accumulated amortization 464 3,821  
Customer relationships      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 8,948 2,605  
Accumulated amortization $ 3,172 $ 5,181