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Related Parties - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Related Party Transactions [Abstract]        
Ownership interest in facilities owned by entities controlled by company's stockholders     100.00%  
Expenses related to transactions with related parties $ 108 $ 134 $ 325 $ 400