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Investments - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
SERP Investments at fair value $ 2,278 $ 1,779  
Virginia Independent Telephone Alliance      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, percentage 23.20%    
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 $ 8,700 7,700  
Other nonoperating income (expense)   4,200 $ 2,800
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 $ 1,000 1,700 2,200
Related party costs $ 3,000 $ 3,400 $ 3,700