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FIXED ASSETS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Fixed Assets
Total plant in service	$ 1,190,375	$ 1,119,952
Total property, plant, and equipment	1,237,555	1,188,916
Less: Accumulated depreciation	(631,974)	(562,064)
Net fixed assets	605,581	626,852
Depreciation and amortization	86,900	83,000	$ 83,300
Capital leased assets, cost	25,900
Capital expenditure grants	3,100	5,400
Capitalized implementation costs	3,600	$ 1,200
Amortization of implementation costs	$ 200
US Telecom
Fixed Assets
Number of cell sites sold | item		100
Proceeds from sale of cell sites		$ 24,000
Book value of disposed cell sites		8,800
Gain on sale of cell sites		15,200
Minimum
Fixed Assets
Useful Life	3 years
Maximum
Fixed Assets
Useful Life	39 years
Telecommunications equipment and towers
Fixed Assets
Total plant in service	$ 979,028	914,275
Capital leased assets, cost		27,700
Capital leased assets, cost	25,900
Capital leased assets, net		$ 20,200
Capital leased assets, net	$ 16,500
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
Solar assets
Fixed Assets
Total plant in service	$ 40,043	$ 38,692
Reclassification from construction in progress		$ 38,600
Solar assets | Minimum
Fixed Assets
Useful Life	20 years	20 years
Solar assets | Maximum
Fixed Assets
Useful Life	23 years	23 years
Office and computer equipment
Fixed Assets
Total plant in service	$ 82,630	$ 77,085
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	$ 48,565	$ 48,900
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	$ 13,424	$ 15,039
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	$ 2,316	$ 2,033
Land
Fixed Assets
Total plant in service	15,503	14,728
Furniture and fixtures
Fixed Assets
Total plant in service	$ 8,866	$ 9,200
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	$ 47,180	$ 68,964

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