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Fair Value Measurements - Bonds (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Fair Value Measurements      
Industrial revenue development bonds, carrying amount, approximates fair value $ 7,500 $ 7,500 $ 7,500
Cost Basis | Level 2      
Fair Value Measurements      
Industrial revenue development bonds, carrying amount, approximates fair value $ 7,500 $ 7,500 $ 7,500