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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Redeemable Noncontrolling Interests - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 22, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation from basic to diluted weighted average common shares outstanding        
Redeemable noncontrolling interests   $ 72,936 $ 0  
Unpaid preferred dividend   2,672 2,703 $ 2,721
Redeemable Common Units        
Reconciliation from basic to diluted weighted average common shares outstanding        
Redeemable noncontrolling interests   22,640 0  
Fair value of common units   22,600    
Allocated losses   6,200    
Increased book value   6,200    
Redeemable Preferred Units        
Reconciliation from basic to diluted weighted average common shares outstanding        
Redeemable noncontrolling interests   50,296 $ 0  
Unpaid dividend   $ 2,000    
Alaska communications        
Reconciliation from basic to diluted weighted average common shares outstanding        
Percentage of additional equity interest 3.00% 3.00%    
Unpaid preferred dividend   $ 2,000    
Alaska communications | Warrant for redeemable common unit        
Reconciliation from basic to diluted weighted average common shares outstanding        
Warrants value   600    
Alaska communications | Redeemable Common Units        
Reconciliation from basic to diluted weighted average common shares outstanding        
Redeemable noncontrolling interests $ 22,600 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 $ 48,300    
Percentage of preferred dividend 9.00% 9.00%