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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the fair values of financial instruments:
September 30, 2022December 31, 2021
 (Amounts in thousands)
Assets
Investments$4,682,815 $5,142,589 
Liabilities
Options sold169 301 
Notes payable349,643 413,378