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Cash and Available-for-Sale Securities
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Cash and Available-for-Sale Securities Cash and Available-for-Sale Securities
Cash, cash equivalents and investments consisted of the following (in thousands): 
September 30, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Cash and
Cash
Equivalents		Investments
Cash$406,338 $— $— $406,338 $406,338 $— 
Time deposits1,255,000 — — 1,255,000 80,000 1,175,000 
Money market funds255,604 — — 255,604 255,604 — 
Totals$1,916,942 $— $— $1,916,942 $741,942 $1,175,000 
December 31, 2019
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Cash and
Cash
Equivalents		Investments
Cash$333,172 $— $— $333,172 $333,172 $— 
Time deposits460,000 — — 460,000 20,000 440,000 
Money market funds284,172 — — 284,172 284,172 — 
Totals$1,077,344 $— $— $1,077,344 $637,344 $440,000 
Cash equivalents and investments are considered available-for-sale securities. We use the specific-identification method for calculating realized gains and losses on securities sold and include them in interest expense, net in the condensed consolidated statements of income. Our investment balances represent time deposits with original maturities of greater than three months and less than one year. Interest income from available-for-sale securities was $2.1 million and $9.7 million in the three and nine months ended September 30, 2020, respectively, and $5.4 million and $15.2 million in the three and nine months ended September 30, 2019, respectively.