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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Assets    
Note receivable $ 9,800 $ 0
Investments    
Assets    
Assets 4,975,032 4,910,800
Fair Value, Measurements, Recurring    
Assets    
Note receivable 9,800  
Liabilities    
Options sold 581 162
Notes payable, fair value 437,445 375,631
Fair Value, Measurements, Recurring | Unsecured debt    
Liabilities    
Notes payable, fair value 362,441 350,644
Fair Value, Measurements, Recurring | Options sold    
Liabilities    
Options sold $ 581 $ 162