SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Non-Cash Investing and Financing Activities:
Property and equipment accrued but unpaid	$ 266,995	$ 219,889
Unsettled purchases of shares of Altice USA, Inc. Class A common stock, pursuant to a share repurchase program	18,942	23,993
Right-of-use assets acquired in exchange for finance lease obligations	38,348	27,674
Distributions to parent	745	150,602
Supplemental Data:
Cash interest paid	310,878	474,268
Income taxes paid, net	9,727	1,195
CSC Holdings
Supplemental Data:
Cash interest paid	310,878	474,268
Income taxes paid, net	$ 9,727	$ 1,195