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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets    
Notes receivable $ 10,024 $ 31,231
Investments    
Assets    
Assets 6,373,605 6,076,370
Fair Value, Measurements, Recurring    
Assets    
Notes receivable 10,024 31,231
Liabilities    
Options sold 599 213
Notes payable 573,172 566,812
Fair Value, Measurements, Recurring | Options sold    
Liabilities    
Options sold $ 599 $ 213