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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the fair values of financial instruments:
March 31, 2024December 31, 2023
 (Amounts in thousands)
Assets
Investments$5,453,126 $5,228,520 
Note receivable9,818 9,974 
Liabilities
Options sold1,928 1,955 
Notes payable560,618 557,710