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RETIREMENT PLANS - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Pension Plans          
Projected benefit obligations:          
Balance at beginning of year $ 80,355 $ 76,119      
Service cost 1,794 1,676 $ 1,308    
Interest cost 3,279 3,388 2,002    
Curtailment     128    
Benefits and settlements paid (4,524) (3,942)      
Actuarial (gain) loss (4,295) 3,114      
Experience (gain) loss 291        
Balance at end of year 76,900 80,355 76,119    
Plan net assets:          
Balance at beginning of year 80,892 75,331      
Actual return on plan assets (730) 8,789      
Company contributions 1,830 842      
Benefits and settlements paid (4,462) (4,070)      
Balance at end of year 77,530 80,892 75,331    
Funded status of plan          
Projected benefit obligation 80,355 76,119 76,119 $ 76,900 $ 80,355
Plan Net Assets 80,892 75,331 75,331 77,530 80,892
Over/ (Under) funded status of plan       630 537
Pension Plans | GT&T Pension Benefit          
Projected benefit obligations:          
Balance at beginning of year 13,205        
Balance at end of year 14,712 13,205      
Plan net assets:          
Balance at beginning of year 10,307        
Balance at end of year 14,105 10,307      
Funded status of plan          
Projected benefit obligation 13,205 13,205   14,712 13,205
Plan Net Assets $ 10,307 10,307   14,105 10,307
Over/ (Under) funded status of plan       (607) (2,898)
Pension Plans | GT&T Pension Benefit | Minimum          
Funded status of plan          
Percentage of plan assets to be invested within Guyana 70.00%        
Pension Plans | GT&T Pension Benefit | Maximum          
Funded status of plan          
Percentage of plan assets to be invested within Guyana 80.00%        
Pension Plans | Viya Pension Benefit          
Projected benefit obligations:          
Balance at beginning of year $ 67,150        
Balance at end of year 62,188 67,150      
Plan net assets:          
Balance at beginning of year 70,585        
Balance at end of year 63,425 70,585      
Funded status of plan          
Projected benefit obligation 67,150 67,150   62,188 67,150
Plan Net Assets 70,585 70,585   63,425 70,585
Over/ (Under) funded status of plan       1,237 3,435
Postretirement Benefits          
Projected benefit obligations:          
Balance at beginning of year 5,307 5,108      
Service cost 147 183 97    
Interest cost 161 206 97    
Benefits and settlements paid (360) (367)      
Actuarial (gain) loss (272) 177      
Experience (gain) loss (971)        
Balance at end of year 4,012 5,307 5,108    
Plan net assets:          
Company contributions 360 367      
Benefits and settlements paid (360) (367)      
Funded status of plan          
Projected benefit obligation $ 5,307 $ 5,108 $ 5,108 4,012 5,307
Over/ (Under) funded status of plan       $ (4,012) $ (5,307)