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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 22, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Reconciliation from basic to diluted weighted average common shares outstanding                  
Redeemable noncontrolling interests   $ 71,820 $ 0 $ 71,820 $ 0 $ 0 $ 0 $ 0 $ 0
Redeemable Common Units                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Redeemable noncontrolling interests   22,640 0 22,640 0 0 0 0 0
Redeemable Preferred Units                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Redeemable noncontrolling interests   49,180 $ 0 49,180 $ 0 $ 0 $ 0 $ 0 $ 0
Alaska communications                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Percentage of additional equity interest 3.00%                
Unpaid preferred dividend $ 800 800   800          
Alaska communications | Warrant for redeemable common unit                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Warrants value   $ 600   $ 600          
Alaska communications | Redeemable Common Units                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Redeemable noncontrolling interests 22,600                
Fair value of common units 22,600                
Alaska communications | Redeemable Preferred Units                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Redeemable noncontrolling interests $ 48,300                
Percentage of preferred dividend 9.00%                
Stock options                  
Reconciliation from basic to diluted weighted average common shares outstanding                  
Stock options (in shares)   5,000 5,000 5,000 5,000