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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization $ 3,591 $ 4,757  
Accumulated amortization 10,454 9,584  
Amortization of intangible assets 1,100 1,400 $ 1,200
Amortization Expense      
2016 870    
2017 827    
2018 802    
2019 547    
2020 545    
Total 3,591    
Non-competition agreements      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 129 236  
Accumulated amortization 4,064 4,046  
Customer relationships      
Acquired identifiable intangible assets      
Acquired identifiable intangible assets, net of accumulated amortization 3,462 4,521  
Accumulated amortization 4,598 3,746  
Other intangible assets      
Acquired identifiable intangible assets      
Accumulated amortization $ 1,792 $ 1,792