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Investment Partnerships - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]      
Deferred tax liability related to investment partnerships $ 30,030,000   $ 17,255,000
Incentive reallocation fee $ 0 $ 0  
Biglari Entities      
Schedule of Equity Method Investments [Line Items]      
Incentive reallocation fee, percentage 25.00%    
Hurdle rate, percentage 6.00%    
Investment Partnerships      
Schedule of Equity Method Investments [Line Items]      
Investment partnerships at cost $ 441,409,000   $ 438,598,000