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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, All Other Investments [Abstract]  
Schedule of Investments
The following table presents our financial instruments:
March 31, 2022December 31, 2021
Cash and equivalents$243,262 $309,171 
Held-to-maturity investments— 98,653 
Available-for-sale investments79,315 — 
Equity investments10,000 10,000 
Total$332,577 $417,824 
Schedule of Unrealized Loss on Investments
The following table presents the components of our available-for-sale investments:
March 31, 2022December 31, 2021
Amortized cost$80,250 $— 
Unrealized gains58 — 
Unrealized losses(993)— 
Estimated fair value$79,315 $— 
Schedule of Available-for-sale Activity
The following table presents the activity on our available-for-sale investments:
Three Months Ended March 31,
20222021
Proceeds from sales and maturities$22,672 $35,031 
Realized gains on sales, net of tax41 —