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Cash and Investments - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 29, 2019
Dec. 28, 2018
Mar. 30, 2018
Dec. 29, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 373,937 $ 314,775 [1] $ 232,331 $ 183,164
Restricted cash included in short-term restricted cash and investments 0 0 [1] 504 504
Restricted cash included in long-term restricted cash and investments 1,100 1,100 [1] 1,500 4,646
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows $ 375,037 $ 315,875 $ 234,335 $ 188,314
[1] The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.