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INVESTMENTS (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 13, 2022
USD ($)
item
Investments                        
Held-to-maturity debt securities $ 87,951       $ 110,801       $ 87,951 $ 110,801    
Cash surrender value of life insurance policies 2,774       2,659       2,774 2,659    
Total 10,297       10,799       10,297 10,799    
Discontinued operations, additional information                        
Assets of discontinued operations         98,779         98,779    
Number of entity's investments which is accounted for using equity method | item                       3
Number of investments which a portion of interest was sold | item                       1
Investment income                 23,467 41,845 $ 40,685  
Gain on sale of discontinued operations                 389,885      
Income tax expense                 94,999 9,411 9,257  
Estimated state income taxes 8,000               8,000      
Income from discontinued operations 5,793 $ 299,934 $ 9,079 $ 3,547 7,545 $ 8,619 $ 49 $ 16,221 318,353 32,434 31,428  
Taxable gain on sale                 477,700      
Discontinued Operations, Previously Recorded At Cost                        
Investments                        
Cash distributions received from partnerships treated as investments at cost                 11,700 20,700 19,100  
GTE Mobilnet of South Texas Limited Partnership                        
Discontinued operations, additional information                        
Ownership percentage of investments at cost                       2.34%
Pittsburgh SMSA Limited Partnership                        
Discontinued operations, additional information                        
Ownership percentage of investments at cost                       3.60%
Discontinued Operations, Previously Recorded Via The Equity Method                        
Discontinued operations, additional information                        
Carrying value of investments in excess of underlying equity         32,800         32,800    
Cash distributions received from partnerships treated as equity method investees                 17,500 22,300 22,400  
Minimum                        
Discontinued operations, additional information                        
Estimated state income taxes 8,000               8,000      
Disposed of by Sale                        
Discontinued operations, additional information                        
Assets of discontinued operations         98,800         98,800    
Number of Wireless Partnerships | item                       5
Discontinued operation, consideration                       $ 490,000
Investment income                 23,467 41,845 40,685  
Gain on sale of discontinued operations                 389,885      
Income from discontinued operations, before income taxes                 413,352 41,845 40,685  
Income tax expense                 94,999 9,411 9,257  
Income from discontinued operations                 318,353 32,434 31,428  
Cash provided by operating activities - discontinued operations                 29,165 43,040 $ 41,529  
Cash provided by investing activities - discontinued operations                 482,966      
Disposed of by Sale | GTE Mobilnet of South Texas Limited Partnership                        
Discontinued operations, additional information                        
Assets of discontinued operations         21,450         21,450    
Disposed of by Sale | Pittsburgh SMSA Limited Partnership                        
Discontinued operations, additional information                        
Assets of discontinued operations         22,950         22,950    
Disposed of by Sale | GTE Mobilnet of Texas RSA #17 Limited Partnership                        
Discontinued operations, additional information                        
Assets of discontinued operations         19,648         19,648    
Disposed of by Sale | Pennsylvania RSA 6(I) Limited Partnership                        
Discontinued operations, additional information                        
Assets of discontinued operations         7,303         7,303    
Disposed of by Sale | Pennsylvania RSA 6(II) Limited Partnership                        
Discontinued operations, additional information                        
Assets of discontinued operations         27,428         27,428    
Cash and cash equivalents                        
Investments                        
Investments in commercial paper         20,000         20,000    
Short-term investments.                        
Investments                        
Investments in commercial paper 88,000       40,000       88,000 40,000    
Investments in certificate of deposits         70,800         70,800    
CoBank, ACB Stock                        
Investments                        
Investments at cost 7,250       7,867       7,250 7,867    
Other                        
Investments                        
Investments at cost $ 273       $ 273       $ 273 $ 273    
GTE Mobilnet of Texas RSA #17 Limited Partnership | GTE Mobilnet of Texas RSA #17 Limited Partnership                        
Discontinued operations, additional information                        
Ownership percentage of equity method investee                       20.51%
Pennsylvania RSA 6(I) Limited Partnership | Pennsylvania RSA 6(I) Limited Partnership                        
Discontinued operations, additional information                        
Ownership percentage of equity method investee                       16.67%
Pennsylvania RSA 6(II) Limited Partnership | Pennsylvania RSA 6(II) Limited Partnership                        
Discontinued operations, additional information                        
Ownership percentage of equity method investee                       23.67%