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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Acquired identifiable intangible assets    
Acquired identifiable intangible assets, net of accumulated amortization $ 7,161 $ 7,846
Accumulated amortization 5,284 4,998
Non-competition agreements    
Acquired identifiable intangible assets    
Acquired identifiable intangible assets, net of accumulated amortization 150 180
Accumulated amortization 175 544
Customer relationships    
Acquired identifiable intangible assets    
Acquired identifiable intangible assets, net of accumulated amortization 7,011 7,666
Accumulated amortization $ 5,109 $ 4,454