IMPACT OF HURRICANES IRMA AND MARIA (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Feb. 28, 2018	Sep. 30, 2019	Sep. 30, 2018
IMPACT OF THE HURRICANES IRMA AND MARIA
Insurance proceeds			$ 34,606
Payment for network repairs and resiliency enhancements		$ 123	78,903
HURRICANES IRMA AND MARIA
IMPACT OF THE HURRICANES IRMA AND MARIA
Insurance proceeds	$ 34,600
Payment for network repairs and resiliency enhancements		$ 100	$ 78,900