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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization $ 2,685 $ 3,591  
Accumulated amortization 9,225 10,454  
Amortization Expense      
2017 812    
2018 787    
2019 542    
2020 488    
2021 56    
Total 2,685    
Amortization of intangible assets 800 1,000 $ 1,400
Non-competition agreements      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 80 129  
Accumulated amortization 3,821 4,064  
Customer relationships      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 2,605 3,462  
Accumulated amortization $ 5,181 $ 4,598