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Summary of Significant Accounting Policies Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 122,869 $ 106,774    
Restricted cash 142 142    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flow $ 123,011 $ 106,916 $ 139,162 $ 114,857