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Nature of Operations and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Jun. 30, 2018
Dec. 30, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 57,049 $ 45,830 $ 60,177 $ 75,425
Restricted cash 1,089 287 975 1,421
Total Cash, Cash Equivalents, and Restricted Cash $ 58,138 $ 46,117 $ 61,152 $ 76,846