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ACQUISITIONS AND DISPOSITIONS - Acquisition of Alaska Communications (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jul. 22, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]          
Redeemable units   $ 85,917 $ 92,469 $ 72,936  
Amount drawn from revolving credit facility   7,300 15,425 37,321  
Revenue   762,216 725,745 602,707  
Pre-tax income (loss)   27,539 8,056 22,687  
Transaction-related charges   $ 551 4,798 10,221  
Minimum          
Business Acquisition [Line Items]          
Useful life   3 years      
Maximum          
Business Acquisition [Line Items]          
Useful life   39 years      
Customer relationships | Minimum          
Business Acquisition [Line Items]          
Intangible assets useful lives   5 years      
Customer relationships | Maximum          
Business Acquisition [Line Items]          
Intangible assets useful lives   13 years      
Trade name licenses | Minimum          
Business Acquisition [Line Items]          
Intangible assets useful lives   6 years      
Trade name licenses | Maximum          
Business Acquisition [Line Items]          
Intangible assets useful lives   15 years      
Redeemable common units          
Business Acquisition [Line Items]          
Redeemable units   $ 25,823 37,317 22,640  
Fair value of units   11,100 22,500    
Redeemable preferred units          
Business Acquisition [Line Items]          
Redeemable units   $ 60,094 $ 55,152 50,296  
Percentage of preferred dividend   9.00%      
Alaska communications          
Business Acquisition [Line Items]          
Price of common share $ 3.40        
Consideration Transferred $ 353,280        
Cash consideration 339,500        
Cash acquired from acquisition $ 11,900        
Percentage of additional equity interest 3.00%        
Accrued consideration $ 1,900        
Payment for purchase of Alaska Communications equity 186,800        
Repayment of Alaska Communications debt 164,600        
Mezzanine equity contribution received from Freedom 3 Investors $ 71,500        
Percentage of voting interest 52.00%        
Deferred revenue from long term customer contracts $ 81,500        
Revenue       110,500  
Pre-tax income (loss)       4,700  
Transaction-related charges 10,500     $ 9,600 $ 900
Alaska communications | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets 34,900        
Alaska communications | Trade name licenses          
Business Acquisition [Line Items]          
Intangible assets $ 9,500        
Alaska communications | Trade name licenses | Minimum          
Business Acquisition [Line Items]          
Intangible assets useful lives 5 years        
Alaska communications | Trade name licenses | Maximum          
Business Acquisition [Line Items]          
Intangible assets useful lives 15 years        
Alaska communications | Telecommunication Equipment | Minimum          
Business Acquisition [Line Items]          
Useful life 2 years        
Alaska communications | Telecommunication Equipment | Maximum          
Business Acquisition [Line Items]          
Useful life 30 years        
Alaska communications | Valuation income and cost approach | Telecommunication Equipment | Minimum          
Business Acquisition [Line Items]          
Discounted rate used for cash flows (as a percent) 4.00%        
Alaska communications | Valuation income and cost approach | Telecommunication Equipment | Maximum          
Business Acquisition [Line Items]          
Discounted rate used for cash flows (as a percent) 14.00%        
Alaska communications | Redeemable common units          
Business Acquisition [Line Items]          
Redeemable units $ 22,600        
Alaska communications | Redeemable preferred units          
Business Acquisition [Line Items]          
Redeemable units $ 48,300        
Percentage of preferred dividend 9.00%        
Alaska credit facility | Alaska communications          
Business Acquisition [Line Items]          
Face amount of debt $ 283,000        
Debt issuance and debt discount costs 6,600        
Alaska revolving facility | Alaska communications          
Business Acquisition [Line Items]          
Face amount of debt 10,000        
Amount drawn from revolving credit facility 63,000        
Alaska Term Facility | Alaska communications          
Business Acquisition [Line Items]          
Face amount of debt $ 210,000