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LONG-TERM DEBT (Details)
9 Months Ended
Jul. 22, 2021
USD ($)
Mar. 26, 2020
USD ($)
Apr. 10, 2019
USD ($)
May 22, 2017
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 01, 2016
USD ($)
Long-term debt                    
Outstanding borrowings         $ 374,616,000 $ 72,823,000        
Current portion of customer receivable credit facility         3,295,000          
Borrowings         27,540,000          
One Communications Debt                    
Long-term debt                    
Financing costs       $ 300,000            
Outstanding debt         10,600,000          
One Communications Debt | Minimum                    
Long-term debt                    
Percentage of notional amount required for hedging arrangement       30.00%            
One Communications Debt | Minimum | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent)       2.50%            
One Communications Debt | Maximum | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent)       2.75%            
Viya Debt                    
Long-term debt                    
Term loan assumed                   $ 60,000,000.0
Net leverage ratio                   3.5
Stated interest rate                 4.00% 4.00%
Financing costs                 $ 900,000  
Intercompany debt limit             $ 75,000,000.0      
Outstanding debt         60,000,000.0          
Unamortized financing costs         500,000          
Revolver loan | Credit facility                    
Long-term debt                    
Maximum borrowing capacity     $ 200,000,000              
Remaining borrowing capacity         119,000,000.0          
Net leverage ratio, if qualifying event     3.25              
Borrowings outstanding         65,000,000.0          
Revolver loan | Credit facility | Minimum                    
Long-term debt                    
Commitment fee (as a percent)     0.15%              
Net leverage ratio     1.75              
Revolver loan | Credit facility | Minimum | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent)     1.25%              
Revolver loan | Credit facility | Minimum | Base rate                    
Long-term debt                    
Basis spread on variable rate (as a percent)     0.25%              
Revolver loan | Credit facility | Maximum                    
Long-term debt                    
Commitment fee (as a percent)     0.375%              
Net leverage ratio     2.75              
Revolver loan | Credit facility | Maximum | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent)     2.25%              
Revolver loan | Credit facility | Maximum | Base rate                    
Long-term debt                    
Basis spread on variable rate (as a percent)     1.25%              
Letter of credit sub-facility | Credit facility                    
Long-term debt                    
Maximum borrowing capacity     $ 75,000,000              
Performance letters of credit issued and outstanding     16,000,000.0   16,000,000.0          
Swingline sub-facility | Credit facility                    
Long-term debt                    
Maximum borrowing capacity     $ 10,000,000              
Base rate before one-week or one-month LIBOR (as a percent)     1.00%              
Swingline sub-facility | Credit facility | Federal Funds Effective Rate                    
Long-term debt                    
Basis spread on variable rate (as a percent)     0.50%              
Term loans | Credit facility                    
Long-term debt                    
Maximum borrowing capacity     $ 200,000,000              
Commnet Finance | Senior secured delayed draw term loan | Receivable credit facility                    
Long-term debt                    
Maximum borrowing capacity   $ 75,000,000.0                
Remaining borrowing capacity         48,500,000          
Outstanding borrowings         26,500,000          
Current portion of customer receivable credit facility         3,300,000          
Financing costs   $ 900,000                
Unamortized financing costs         700,000          
Commnet Finance | Senior secured delayed draw term loan | Receivable credit facility | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent)   2.50%                
Commnet Finance | Senior secured delayed draw term loan | Receivable credit facility | Base rate                    
Long-term debt                    
Basis spread on variable rate (as a percent)   1.50%                
Cash flow hedge | Interest rate swap                    
Long-term debt                    
Notional amount         6,500,000     $ 11,000,000.0    
Interest rate (as a percent)               1.874%    
Alaska communications | Alaska credit facility                    
Long-term debt                    
Maximum borrowing capacity $ 210,000,000.0                  
Borrowings 220,000,000                  
Principal amount $ 283,000,000                  
Fixed charge coverage ratio 1.25                  
Net total leverage ratio 4.00                  
Consolidated EBITDA 12 months                  
Frequency of periodic payment quarterly                  
Alaska communications | Alaska credit facility | Base rate                    
Long-term debt                    
Basis spread on variable rate (as a percent) 1.00%                  
Alaska communications | Alaska credit facility | Minimum | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent) 3.00%                  
Alaska communications | Alaska credit facility | Maximum | LIBOR                    
Long-term debt                    
Basis spread on variable rate (as a percent) 4.00%                  
Alaska communications | Revolver loan | Alaska credit facility                    
Long-term debt                    
Maximum borrowing capacity $ 35,000,000.0                  
Borrowings 10,000,000.0                  
Alaska communications | Term loans | Alaska credit facility                    
Long-term debt                    
Borrowings 210,000,000.0                  
Alaska communications | Incremental term loans | Alaska credit facility | Minimum                    
Long-term debt                    
Maximum borrowing capacity $ 70,000,000.0                  
Alaska communications | Cash flow hedge | Interest rate swap                    
Long-term debt                    
Notional amount         $ 124,900,000          
Interest rate (as a percent) 1.6735%                  
Period of fourth quarter of 2023 To third quarter 2024 | Alaska communications | Alaska credit facility                    
Long-term debt                    
Periodic payment, principal $ 1,312,500                  
Period of fourth quarter of 2024 To third quarter of 2026 | Alaska communications | Alaska credit facility                    
Long-term debt                    
Periodic payment, principal $ 2,625,000                  
Period of second quarter of 2024 | Alaska communications | Alaska credit facility                    
Long-term debt                    
Net total leverage ratio 3.75