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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the fair values of financial instruments:
March 31, 2023December 31, 2022
 (Amounts in thousands)
Assets
Investments$4,975,032 $4,910,800 
Note receivable9,800 — 
Liabilities
Options sold581 162 
Notes payable437,445 375,631