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Nature of Operations and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 72,210 $ 75,425 $ 71,540 $ 71,487
Restricted cash 1,532 1,421 1,543 2,082
Total Cash, Cash Equivalents, and Restricted Cash $ 73,742 $ 76,846 $ 73,083 $ 73,569