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Cash and Investments (Tables)
 3 Months Ended
Apr. 02, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash A reconciliation of cash, cash equivalents, and restricted cash equivalents reported in the accompanying Condensed Consolidated Balance Sheets to the amount reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
 
March 31, 2021December 31, 2020
Cash and cash equivalents$370,209 $319,217 
Restricted cash equivalents included in other long-term assets49,712 1,555 
Cash, cash equivalents, and restricted cash equivalents as reported in the accompanying Condensed Consolidated Statements of Cash Flows$419,921 $320,772 
Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash A reconciliation of cash, cash equivalents, and restricted cash equivalents reported in the accompanying Condensed Consolidated Balance Sheets to the amount reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
 
March 31, 2021December 31, 2020
Cash and cash equivalents$370,209 $319,217 
Restricted cash equivalents included in other long-term assets49,712 1,555 
Cash, cash equivalents, and restricted cash equivalents as reported in the accompanying Condensed Consolidated Statements of Cash Flows$419,921 $320,772 
Schedule of Investments by Security Type
Cash, cash equivalents, restricted cash equivalents and investments consisted of the following (in thousands):
March 31, 2021
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value
Debt securities available-for-sale:
Commercial paper$667,071 $219 $(1)$667,289 
Corporate bonds495,490 3,609 (275)498,824 
U.S. Treasury and government-sponsored enterprises148,208 83 (7)148,284 
Municipal bonds27,776 64 (8)27,832 
Total debt securities available-for-sale1,338,545 3,975 (291)1,342,229 
Cash52,757 — — 52,757 
Money market funds105,775 — — 105,775 
Certificates of deposit63,305 — — 63,305 
Total cash, cash equivalents, restricted cash equivalents and investments$1,560,382 $3,975 $(291)$1,564,066 
December 31, 2020
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value
Debt securities available-for-sale:
Commercial paper$569,456 $372 $— $569,828 
Corporate bonds543,520 5,244 (7)548,757 
U.S. Treasury and government-sponsored enterprises208,326 232 (4)208,554 
Municipal bonds28,680 83 (1)28,762 
Total debt securities available-for-sale1,349,982 5,931 (12)1,355,901 
Cash82,176 — — 82,176 
Money market funds40,761 — — 40,761 
Certificates of deposit60,004 — — 60,004 
Total cash, cash equivalents, restricted cash equivalents and investments
$1,532,923 $5,931 $(12)$1,538,842 
Schedule of Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position The fair value and gross unrealized losses on debt securities available-for-sale in an unrealized loss position were as follows (in thousands):
March 31, 2021
Fair Value
Gross Unrealized Losses
Commercial paper$4,722 $(1)
Corporate bonds131,468 (275)
U.S. Treasury and government-sponsored enterprises31,981 (7)
Municipal bonds12,120 (8)
Total$180,291 $(291)
December 31, 2020
Fair Value
Gross Unrealized Losses
Corporate bonds$28,445 $(7)
U.S. Treasury and government-sponsored enterprises21,989 (4)
Municipal bonds5,865 (1)
Total$56,299 $(12)
Schedule of Fair Value of Cash Equivalents and Investments by Contractual Maturity
The fair value of debt securities available-for-sale by contractual maturity was as follows (in thousands):
 
March 31, 2021December 31, 2020
Maturing in one year or less$1,021,369 $1,034,150 
Maturing after one year through five years320,860 321,751 
Total debt securities available-for-sale$1,342,229 $1,355,901