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INVESTMENTS - Schedule of Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investments      
Cash distributions received from partnerships treated as investments at cost $ 20,700 $ 19,100 $ 16,800
Investments      
Held-to-maturity debt securities 110,801    
Cash surrender value of life insurance policies 2,659 2,536  
Total 109,578 $ 111,665  
Cash and cash equivalents      
Investments      
Investments in commercial paper 20,000    
Short-term investments      
Investments      
Investments in commercial paper 40,000    
Investments in certificate of deposits $ 70,800    
GTE Mobilnet of South Texas Limited Partnership      
Investments      
Ownership percentage of investments at cost 2.34% 2.34%  
Investments      
Investments at cost $ 21,450 $ 21,450  
Pittsburgh SMSA Limited Partnership      
Investments      
Ownership percentage of investments at cost 3.60% 3.60%  
Investments      
Investments at cost $ 22,950 $ 22,950  
CoBank, ACB Stock      
Investments      
Investments at cost 7,867 8,882  
Other      
Investments      
Investments at cost $ 273 $ 273  
GTE Mobilnet of Texas RSA #17 Limited Partnership      
Investments      
Ownership percentage of equity method investee 20.51% 20.51%  
Investments      
Equity method investments $ 19,648 $ 20,299  
Pennsylvania RSA 6(I) Limited Partnership      
Investments      
Ownership percentage of equity method investee 16.67% 16.67%  
Investments      
Equity method investments $ 7,303 $ 7,482  
Pennsylvania RSA 6(II) Limited Partnership      
Investments      
Ownership percentage of equity method investee 23.67% 23.67%  
Investments      
Equity method investments $ 27,428 $ 27,793