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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, All Other Investments [Abstract]  
Schedule of Investments
The following table presents our financial instruments:
June 30, 2022December 31, 2021
Cash and cash equivalents$253,062 $309,171 
Held-to-maturity investments— 98,653 
Available-for-sale investments60,930 — 
Equity investments10,000 10,000 
Total$323,992 $417,824 
Schedule of Available-for-sale Activity
The following table presents the components of our available-for-sale investments:
June 30, 2022December 31, 2021
Amortized cost$62,016 $— 
Unrealized gains39 — 
Unrealized losses(1,125)— 
Estimated fair value$60,930 $— 
The following table presents the activity on our available-for-sale investments:
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Proceeds from sales and maturities$17,923 $56,364 $40,595 $91,395 
Realized losses on sales, net of tax(48)— (7)—