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Summary of Significant Accounting Policies Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Sep. 29, 2018
Dec. 30, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 69,122 $ 107,262    
Restricted cash 159 107    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flow $ 69,281 $ 107,369 $ 81,573 $ 106,916