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Cash, Cash Equivalents and Restricted Cash
 12 Months Ended
Dec. 31, 2020
Short-Term Investments And Fair Value Measurement [Abstract]  
Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents and Restricted Cash
The following tables summarize the Company's cash, cash equivalents and restricted cash as of December 31, 2020 and 2019:
 As of December 31, 2020
 Cash and cash equivalentsOther Current AssetsNon-current AssetsTotal
 (in thousands)
Cash$3,331,860 $1,783 $31,284 $3,364,927 
Level 1 securities:
Money market funds4,573,690 — 253 4,573,943 
Level 2 securities:
Foreign Time Deposits300,000 — 300,000 
$8,205,550 $1,783 $31,537 $8,238,870 


 As of December 31, 2019
 Cash and cash equivalentsOther Current AssetsNon-current AssetsTotal
 (in thousands)
Cash$3,103,525 $1,863 $22,161 $3,127,549 
Level 1 securities:
Money market funds1,614,912 — 1,325 1,616,237 
Level 2 securities:
Foreign Time Deposits300,000 — — 300,000 
$5,018,437 $1,863 $23,486 $5,043,786 

Other current assets include restricted cash for deposits related to self insurance. Non-current assets include restricted cash related to letter of credit agreements. Foreign time deposits of $300 million, classified as Level 2 securities, were included in Cash and cash equivalents on the Company's Balance Sheet as of December 31, 2020 and December 31, 2019. The fair value of cash equivalents included in the Level 2 category is based on observable inputs, such as quoted prices for similar assets at the measurement date; quoted prices in markets that are not active; or other inputs that are observable, either directly or indirectly.
See Note 6 to the consolidated financial statements for further information regarding the fair value of the Company’s senior notes.