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FIXED ASSETS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fixed Assets      
Total plant in service $ 1,660,964 $ 1,201,871  
Total property, plant, and equipment 1,748,092 1,252,780  
Less: Accumulated depreciation (804,883) (716,318)  
Net fixed assets 943,209 536,462  
Depreciation and amortization 102,700 86,500 $ 87,000
Capital expenditure grants 7,500 16,300  
Capitalized implementation costs 8,000 5,600  
Amortization of implementation costs $ 1,200 700  
Minimum      
Fixed Assets      
Useful Life 3 years    
Maximum      
Fixed Assets      
Useful Life 39 years    
Telecommunications equipment and towers      
Fixed Assets      
Total plant in service $ 1,309,608 1,012,457  
Capital leased assets, cost 30,800 25,400  
Capital leased assets, net $ 18,700 $ 15,900  
Telecommunications equipment and towers | Minimum      
Fixed Assets      
Useful Life 5 years 5 years  
Telecommunications equipment and towers | Maximum      
Fixed Assets      
Useful Life 15 years 15 years  
Office and computer equipment      
Fixed Assets      
Total plant in service $ 153,371 $ 87,427  
Office and computer equipment | Minimum      
Fixed Assets      
Useful Life 3 years 3 years  
Office and computer equipment | Maximum      
Fixed Assets      
Useful Life 10 years 10 years  
Buildings      
Fixed Assets      
Total plant in service $ 125,688 $ 52,048  
Buildings | Minimum      
Fixed Assets      
Useful Life 15 years 15 years  
Buildings | Maximum      
Fixed Assets      
Useful Life 39 years 39 years  
Transportation vehicles      
Fixed Assets      
Total plant in service $ 25,420 $ 13,730  
Transportation vehicles | Minimum      
Fixed Assets      
Useful Life 3 years 3 years  
Transportation vehicles | Maximum      
Fixed Assets      
Useful Life 10 years 10 years  
Leasehold improvements      
Fixed Assets      
Total plant in service $ 23,783 $ 16,709  
Land      
Fixed Assets      
Total plant in service 10,610 8,180  
Furniture and fixtures      
Fixed Assets      
Total plant in service $ 12,484 $ 11,320  
Furniture and fixtures | Minimum      
Fixed Assets      
Useful Life 5 years 5 years  
Furniture and fixtures | Maximum      
Fixed Assets      
Useful Life 10 years 10 years  
Construction in progress      
Fixed Assets      
Total property, plant, and equipment $ 87,128 $ 50,909