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RETIREMENT PLANS - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Pension Plans          
Projected benefit obligations:          
Balance at beginning of year $ 76,900 $ 80,355      
Service cost 1,709 1,794 $ 1,676    
Interest cost 3,472 3,279 3,388    
Benefits and settlements paid (5,738) (4,524)      
Actuarial (gain) loss 5,739 (4,004)      
Settlement (105)        
Balance at end of year 81,977 76,900 80,355    
Plan net assets:          
Balance at beginning of year 77,530 80,892      
Actual return on plan assets 10,678 (730)      
Company contributions 838 1,830      
Benefits and settlements paid (5,696) (4,462)      
Balance at end of year 83,350 77,530 80,892    
Funded status of plan          
Projected benefit obligation 76,900 76,900 80,355 $ 81,977 $ 76,900
Plan Net Assets 83,350 80,892 80,892 83,350 77,530
Over/ (Under) funded status of plan       1,373 630
Pension Plans | GT&T Pension Benefit          
Projected benefit obligations:          
Balance at beginning of year 14,712        
Balance at end of year 15,594 14,712      
Plan net assets:          
Balance at beginning of year 14,105        
Balance at end of year 15,054 14,105      
Funded status of plan          
Projected benefit obligation 14,712 14,712   15,594 14,712
Plan Net Assets 14,105 14,105   15,054 14,105
Over/ (Under) funded status of plan       (540) (607)
Pension Plans | Viya Pension Benefit          
Projected benefit obligations:          
Balance at beginning of year 62,188        
Balance at end of year 66,383 62,188      
Plan net assets:          
Balance at beginning of year 63,425        
Balance at end of year 68,296 63,425      
Funded status of plan          
Projected benefit obligation 62,188 62,188   66,383 62,188
Plan Net Assets 63,425 63,425   68,296 63,425
Over/ (Under) funded status of plan       1,913 1,237
Postretirement Benefits          
Projected benefit obligations:          
Balance at beginning of year 4,012 5,307      
Service cost 126 147 183    
Interest cost 182 161 206    
Benefits and settlements paid (354) (360)      
Actuarial (gain) loss 933 (1,243)      
Balance at end of year 4,899 4,012 5,307    
Plan net assets:          
Company contributions 354 360      
Benefits and settlements paid (354) (360)      
Funded status of plan          
Projected benefit obligation $ 4,899 $ 4,012 $ 5,307 4,899 4,012
Over/ (Under) funded status of plan       $ (4,899) $ (4,012)