REVENUE AND CONTRACT ASSETS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 2,451,081	$ 2,364,153	$ 4,847,648	$ 4,693,867
Pay TV
Disaggregation of Revenue [Line Items]
Revenues	1,018,426	1,034,404	2,035,756	2,068,112
Broadband
Disaggregation of Revenue [Line Items]
Revenues	806,250	712,202	1,581,823	1,413,823
Telephony
Disaggregation of Revenue [Line Items]
Revenues	150,232	163,499	304,696	329,537
Business services and wholesale
Disaggregation of Revenue [Line Items]
Revenues	357,806	337,388	708,495	670,478
Advertising
Disaggregation of Revenue [Line Items]
Revenues	112,953	109,898	206,498	197,480
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 5,414	$ 6,762	$ 10,380	$ 14,437