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Fair Value Measurement
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurement Fair Value Measurement
The following table summarizes, by major security type, our available-for-sale securities and derivative contracts as of September 30, 2020 and December 31, 2019 that were measured at fair value on a recurring basis and were categorized using the fair value hierarchy (in thousands): 
September 30, 2020December 31, 2019
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Total
Estimated
Fair Value
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Total
Estimated
Fair Value  
Assets:
Available-for-sale securities:
Time deposits$— $1,255,000 $1,255,000 $— $460,000 $460,000 
Money market funds255,604 — 255,604 284,172 — 284,172 
Foreign exchange forward contracts— 4,079 4,079 — 2,508 2,508 
Totals$255,604 $1,259,079 $1,514,683 $284,172 $462,508 $746,680 
Liabilities:
Interest rate contracts$— $4,143 $4,143 $— $1,515 $1,515 
Foreign exchange forward contracts— 4,221 4,221 — 182 182 
Totals$— $8,364 $8,364 $— $1,697 $1,697 
As of September 30, 2020, our available-for-sale securities included time deposits and money market funds and their carrying values were approximately equal to their fair values. Time deposits were measured at fair value using Level 2 inputs and money market funds were measured using quoted prices in active markets, which represent Level 1 inputs. Level 2 inputs, obtained from various third party data providers, represent quoted prices for similar assets in active markets, or these inputs
were derived from observable market data, or if not directly observable, were derived from or corroborated by other observable market data.
Our derivative assets and liabilities include interest rate and foreign exchange derivatives that are measured at fair value using observable market inputs such as forward rates, interest rates, our own credit risk as well as an evaluation of our counterparties’ credit risks. Based on these inputs, the derivative assets and liabilities are classified within Level 2 of the fair value hierarchy.
There were no transfers between the different levels of the fair value hierarchy in 2020 or 2019.
As of September 30, 2020, the carrying amount of investments measured using the measurement alternative for equity investments without a readily determinable fair value was $4.5 million. The carrying amount, which is recorded within other non-current assets, represents the purchase price paid in 2018.
As of September 30, 2020, the estimated fair values of our 1.875% exchangeable senior notes due 2021, or the 2021 Notes, our 1.50% exchangeable senior notes due 2024, or the 2024 Notes, and our 2.00% exchangeable senior notes due 2026, or the 2026 Notes, were approximately $222 million, $584 million and $1.2 billion, respectively. The fair values of the 2021 Notes, the 2024 Notes and the 2026 Notes, which we refer to collectively as the Exchangeable Senior Notes, were estimated using quoted market prices obtained from brokers (Level 2). The estimated fair value of our borrowing under our term loan was approximately equal to its book value based on the borrowing rates currently available for variable rate loans (Level 2).