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LONG-TERM DEBT (Details)
12 Months Ended
Jul. 22, 2021
USD ($)
Apr. 10, 2019
USD ($)
May 22, 2017
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 26, 2020
USD ($)
Dec. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 01, 2016
USD ($)
Long-term debt                      
Outstanding borrowings       $ 366,544,000   $ 72,823,000          
Current portion of customer receivable credit facility       4,620,000              
Borrowings       37,321,000              
Repayment of credit facility       1,828,000              
One Communications Debt                      
Long-term debt                      
Outstanding debt       4,700,000              
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               $ 51,600,000      
Outstanding debt       60,000,000.0              
Unamortized financing costs       400,000              
Revolver loan | Credit facility                      
Long-term debt                      
Maximum borrowing capacity   $ 200,000,000                  
Remaining borrowing capacity       122,500,000              
Net leverage ratio, if qualifying event   3.25                  
Borrowings outstanding       61,500,000              
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                  
Senior secured delayed draw term loan | Receivable credit facility                      
Long-term debt                      
Maximum borrowing capacity             $ 75,000,000.0        
Remaining borrowing capacity       37,700,000              
Outstanding borrowings       35,500,000              
Current portion of customer receivable credit facility       4,600,000              
Financing costs             $ 900,000        
Unamortized financing costs       700,000              
Designated as cash flow hedges | Interest rate derivative                      
Long-term debt                      
Notional amount       6,200,000         $ 11,000,000.0    
Interest rate (as a percent)                 1.874%    
Alaska communications | Alaska credit facility                      
Long-term debt                      
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 | Alaska Term Loan                      
Long-term debt                      
Principal amount $ 210,000,000                    
Alaska communications | Revolver loan | Alaska credit facility                      
Long-term debt                      
Maximum borrowing capacity 35,000,000.0                    
Outstanding borrowings       2,000,000.0              
Alaska communications | Revolver loan | Alaska Term Loan                      
Long-term debt                      
Outstanding 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 | Designated as cash flow hedges | Interest rate derivative                      
Long-term debt                      
Notional amount         $ 121,500,000            
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                    
Debt Instrument, From Fourth Quarter of 2024 To Third Quarter of 2026 [Member] | 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