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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2022
Investments, All Other Investments [Abstract]  
Schedule of Investments
The following table presents our financial instruments:
September 30, 2022December 31, 2021
Cash and cash equivalents$185,927 $309,171 
Held-to-maturity investments— 98,653 
Available-for-sale investments61,987 — 
Equity investments10,000 10,000 
Total$257,914 $417,824 
Schedule of Available-for-sale Activity
The following table presents the components of our available-for-sale investments:
September 30, 2022December 31, 2021
Amortized cost$63,122 $— 
Unrealized gains50 — 
Unrealized losses(1,185)— 
Estimated fair value$61,987 $— 
The following table presents the activity on our available-for-sale investments:
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Proceeds from sales and maturities$14,457 $23,168 $55,052 $114,563 
Realized losses on sales, net of tax(72)— (79)—