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Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]            
SERP investments at fair value $ 2,649   $ 2,649     $ 2,290
CoBank            
Schedule of Equity Method Investments [Line Items]            
SERP investments at fair value 11,800   11,800   $ 1,600 $ 10,100
Other nonoperating income (expense) $ 400 $ 100 $ 1,100 $ 400    
Percentage of patronage credit paid in cash 88.00%   88.00%      
Percentage of patronage credit paid in share 12.00%   12.00%