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INVESTMENTS - Schedule of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Investments          
Cash distributions received from partnerships treated as investments at cost $ 3,900 $ 5,000 $ 9,200 $ 8,300  
Investments          
Cash surrender value of life insurance policies 2,713   2,713   $ 2,474
Total $ 112,541   $ 112,541   $ 112,717
GTE Mobilnet of South Texas Limited Partnership          
Investments          
Ownership percentage of investments at cost 2.34%   2.34%   2.34%
Investments          
Investments at cost $ 21,450   $ 21,450   $ 21,450
Pittsburgh SMSA Limited Partnership          
Investments          
Ownership percentage of investments at cost 3.60%   3.60%   3.60%
Investments          
Investments at cost $ 22,950   $ 22,950   $ 22,950
CoBank, ACB Stock          
Investments          
Investments at cost 8,882   8,882   8,910
Other          
Investments          
Investments at cost $ 273   $ 273   $ 298
GTE Mobilnet of Texas RSA #17 Limited Partnership          
Investments          
Ownership percentage of equity method investee 20.51%   20.51%   20.51%
Investments          
Equity method investments $ 19,372   $ 19,372   $ 20,162
Pennsylvania RSA 6(I) Limited Partnership          
Investments          
Ownership percentage of equity method investee 16.67%   16.67%   16.67%
Investments          
Equity method investments $ 7,687   $ 7,687   $ 7,658
Pennsylvania RSA 6(II) Limited Partnership          
Investments          
Ownership percentage of equity method investee 23.67%   23.67%   23.67%
Investments          
Equity method investments $ 29,214   $ 29,214   $ 28,815