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FIXED ASSETS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Fixed Assets
Total plant in service	$ 1,081,318	$ 1,046,805
Total property, plant, and equipment	1,188,916	1,169,806
Less: Accumulated depreciation	(562,064)	(526,660)
Net fixed assets	626,852	643,146
Depreciation and amortization	83,000	83,300	$ 73,300
Capital expenditures offset by grants	0	1,500	2,300
Proceeds from sale of cell sites	$ 6,900		$ 1,424
U.S. 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	$ 914,276	774,548
Capital leased assets, cost	27,700	30,000
Capital leased assets, net	20,200	24,400
Remaining amounts due under the Indefeasible rights of use	$ 1,300	$ 600
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	$ 57	$ 113,218
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	$ 77,085	$ 76,706
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	$ 48,900	$ 48,058
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	$ 15,039	$ 12,221
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	$ 2,033	$ 2,864
Land
Fixed Assets
Total plant in service	14,728	12,516
Furniture and fixtures
Fixed Assets
Total plant in service	$ 9,200	$ 6,674
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	$ 107,598	$ 123,001

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