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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets    
Notes receivable $ 31,948 $ 9,974
Investments    
Assets    
Assets 6,018,381 5,228,520
Fair Value, Measurements, Recurring    
Assets    
Notes receivable 31,948 9,974
Liabilities    
Options sold 620 1,955
Notes payable 571,024 557,710
Fair Value, Measurements, Recurring | Options sold    
Liabilities    
Options sold $ 620 $ 1,955