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IMPACT OF HURRICANES IRMA AND MARIA (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Feb. 28, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
IMPACT OF THE HURRICANES IRMA AND MARIA
Pre-tax loss		$ (4,307)	$ 6,678	$ 1,753	$ 1,948	$ 11,336	$ 27,920	$ 12,868	$ 1,618	$ 6,072	$ 53,742	$ 47,553
Loss on damaged assets from Hurricanes												35,443
Insurance proceeds											34,606
Payment for network repairs and resiliency enhancements										123	80,152	8,585
HURRICANES IRMA AND MARIA
IMPACT OF THE HURRICANES IRMA AND MARIA
Pre-tax loss												(4,000)
Loss on damaged assets from Hurricanes												35,400
Insurance proceeds	$ 34,600
Additional operating expenses												3,200
Payment for network repairs and resiliency enhancements										$ 100	80,200	$ 8,600
HURRICANES IRMA AND MARIA | Universal Service Fund programs
IMPACT OF THE HURRICANES IRMA AND MARIA
Revenue											$ 15,500

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