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Indebtedness (Covenants in the Line of Credit) (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Debt Disclosure [Abstract]  
Consolidated net worth, minimum requirement $ 2,200,000
Consolidated net worth, actual $ 3,300,000
Debt-to-capitalization ratio, maximum requirement 35.00% [1]
Debt-to-capitalization ratio, actual 13.20% [1]
[1] Calculated in accordance with the Line of Credit.