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INVESTMENTS - Schedule of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Investments      
Cash distributions received from partnerships treated as investments at cost $ 4,300 $ 5,300  
Impairment loss 0 $ 0  
Investments      
Cash surrender value of life insurance policies 2,699   $ 2,536
Total $ 110,801   $ 111,665
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 $ 19,932   $ 20,299
Pennsylvania RSA 6(I) Limited Partnership      
Investments      
Ownership percentage of equity method investee 16.67%   16.67%
Investments      
Equity method investments $ 7,398   $ 7,482
Pennsylvania RSA 6(II) Limited Partnership      
Investments      
Ownership percentage of equity method investee 23.67%   23.67%
Investments      
Equity method investments $ 28,232   $ 27,793