REVENUE AND CONTRACT ASSETS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 2,438,662	$ 2,417,801	$ 7,286,310	$ 7,111,668
Pay TV
Disaggregation of Revenue [Line Items]
Revenues	993,158	1,054,667	3,028,914	3,122,779
Broadband
Disaggregation of Revenue [Line Items]
Revenues	814,328	729,907	2,396,151	2,143,730
Telephony
Disaggregation of Revenue [Line Items]
Revenues	148,231	161,351	452,927	490,888
Business services and wholesale
Disaggregation of Revenue [Line Items]
Revenues	357,628	344,193	1,066,123	1,014,671
Mobile [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,174	0	3,174	0
Advertising and News [Member]
Disaggregation of Revenue [Line Items]
Revenues	118,067	123,913	327,255	323,992
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 4,076	$ 3,770	$ 11,766	$ 15,608