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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the fair values of financial instruments:
June 30, 2023December 31, 2022
 (Amounts in thousands)
Assets
Investments$4,955,185 $4,910,800 
Note receivable9,925 — 
Liabilities
Options sold817 162 
Notes payable429,651 375,631