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Nature of Operations and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
Mar. 31, 2018
Dec. 30, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 56,478 $ 45,830 $ 72,210 $ 75,425
Restricted cash 697 287 1,532 1,421
Total Cash, Cash Equivalents, and Restricted Cash $ 57,175 $ 46,117 $ 73,742 $ 76,846