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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2023
Investments, All Other Investments [Abstract]  
Schedule of Investments
The following table presents our financial instruments:
June 30, 2023December 31, 2022
Cash and cash equivalents$118,764 $173,857 
Available-for-sale investments29,216 55,538 
Equity investments10,000 10,000 
Total$157,980 $239,395 
Schedule of Available-for-sale Activity
The following table presents the components of our available-for-sale investments:
June 30, 2023December 31, 2022
Amortized cost$30,269 $56,670 
Unrealized gains— 16 
Unrealized losses(1,053)(1,148)
Estimated fair value$29,216 $55,538 
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Proceeds from sales and maturities$14,132 $17,923 $37,107 $40,595 
Realized losses on sales, net of tax(1)(48)(1)(7)