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Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
SERP Investments at fair value $ 1,706   $ 2,278
Valley Network Partnership      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, percentage 20.00%    
CoBank      
Schedule of Equity Method Investments [Line Items]      
SERP Investments at fair value $ 9,000   $ 8,700
Other nonoperating income (expense) 1,000 $ 900  
Percentage of patronage credit paid in cash   75.00%  
Percentage of patronage credit paid in share   25.00%  
Equity Method Investee      
Schedule of Equity Method Investments [Line Items]      
Revenue from related parties 200    
Related party costs $ 800 $ 700