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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets    
Note receivable $ 9,818 $ 9,974
Investments    
Assets    
Assets 5,453,126 5,228,520
Fair Value, Measurements, Recurring    
Assets    
Note receivable 9,818 9,974
Liabilities    
Options sold 1,928 1,955
Notes payable 560,618 557,710
Fair Value, Measurements, Recurring | Unsecured debt    
Liabilities    
Notes payable 360,611 357,765
Fair Value, Measurements, Recurring | Options sold    
Liabilities    
Options sold $ 1,928 $ 1,955