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Cash and Cash Equivalents, Investments and Restricted Cash
 12 Months Ended
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents, Investments and Restricted Cash Cash and Cash Equivalents, Investments and Restricted Cash
The following tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, investments, including beneficial interests in securitizations, and restricted cash as of the dates presented (in thousands):
 December 31, 2021
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Market
Value
Cash$479,110 $— $— $479,110 
Cash equivalents:
Money market funds2,132,389 — — 2,132,389 
Short-term investments:
U.S. government agency securities472,570 — (1,719)470,851 
Corporate bonds33,172 3 (95)33,080 
Commercial paper9,991 — — 9,991 
Restricted cash226,651 — — 226,651 
Beneficial interests in securitizations66,167 8,936 — 75,103 
Total$3,420,050 $8,939 $(1,814)$3,427,175 

 December 31, 2020
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Market
Value
Cash$213,518 $— $— $213,518 
Cash equivalents:
Money market funds1,486,384 — — 1,486,384 
Municipal securities3,229 — (1)3,228 
Short-term investments:
Treasury bills1,163,748 65 — 1,163,813 
U.S. government agency securities1,037,572 57 (52)1,037,577 
Municipal securities16,226 — (6)16,220 
Certificates of deposit498 — — 498 
Restricted cash75,805 — — 75,805 
Total$3,996,980 $122 $(59)$3,997,043 
The following table presents available-for-sale investments by contractual maturity date as of December 31, 2021 (in thousands):
Amortized CostEstimated Fair
Market Value
Due in one year or less$180,857 $180,549 
Due after one year 401,043 408,476 
Total $581,900 $589,025 
All short-term investments as of December 31, 2020 had a contractual maturity date of one year or less.