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Cash and Investments - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 28, 2018
Sep. 28, 2018
Dec. 29, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 242,317 $ 314,775 [1] $ 353,623 $ 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 1,000 1,100 [1] 1,100 4,646
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows $ 243,317 $ 315,875 $ 355,227 $ 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.