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Nature of Operations and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Sep. 28, 2019
Dec. 29, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 53,554 $ 66,786 $ 48,650 $ 45,830
Restricted cash 2,650 1,487 1,321 287
Total Cash, Cash Equivalents, and Restricted Cash $ 56,204 $ 68,273 $ 49,971 $ 46,117