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Cash and Investments in Marketable Securities
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Cash and Investments in Marketable Securities Cash and Investments in Marketable Securities
Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):
Estimated Fair Value at
March 31, 2020December 31, 2019
Cash and cash equivalents$227,035  $96,363  
Short-term investments1,118,847  1,228,499  
Long-term investments185,900  279,119  
Total cash and investments in marketable securities$1,531,782  $1,603,981  
We invest in liquid, high quality debt securities. Our investments in debt securities are subject to interest rate risk. To minimize the exposure due to an adverse shift in interest rates, we invest in securities with maturities of two years or less and maintain a weighted average maturity of one year or less. As of March 31, 2020 and December 31, 2019, all of our long-term investments had maturities between one and two years.
During the three months ended March 31, 2020 and March 31, 2019, we sold no available-for-sale securities. The cost of securities sold is based on the specific identification method. To repay our senior notes and accrued interest of $254.8 million on April 13, 2020, we did not sell any available-for-sale securities.
We report our accrued interest receivable, which totaled $6.2 million and $6.5 million at March 31, 2020 and December 31, 2019, respectively, in other current assets on our Condensed Consolidated Balance Sheets.
Our portfolio of cash and investments in marketable securities includes (in thousands):
March 31, 2020December 31, 2019
Fair Value
Hierarchy
Level
Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueFair Value
Corporate notes and bonds2$989,511  $736  $(4,010) $986,237  $1,132,182  
Corporate commercial paper2373,237  94  (108) 373,223  375,473  
Available-for-sale investments$1,362,748  $830  $(4,118) $1,359,460  $1,507,655  
Money market funds1158,080  83,546  
Certificates of depositN/A8,248  6,951  
CashN/A5,994  5,829  
Total cash and investments in marketable securities$1,531,782  $1,603,981  

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
        
        We use a market approach to value our Level 2 investments. The disclosed fair value related to our investments is based on market prices from a variety of industry standard data providers and generally represents quoted prices for similar assets in active markets or has been derived from observable market data.
        
Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.