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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Measurements, Recurring    
Liabilities    
Options sold $ 162 $ 301
Notes payable 375,631 413,378
Fair Value, Measurements, Recurring | Call Option    
Liabilities    
Options sold 162 301
Investments    
Assets    
Investments $ 4,910,800 $ 5,142,589