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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the fair values of financial instruments:
 December 31,
 20222021
 (Amounts in thousands)
Assets
Investments$4,910,800 $5,142,589 
Liabilities
Options sold 162 301 
Notes payable 375,631 413,378