SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Non-Cash Investing and Financing Activities:
Property and equipment accrued but unpaid	$ 238,163	$ 217,927
Unsettled purchases of shares of Altice USA, Inc. Class A common stock, pursuant to a share repurchase program	0	15,399
Right-of-use assets acquired in exchange for finance lease obligations	107,708	110,800
Costs relating to financing transactions accrued but unpaid	500	10,032
Distributions to parent	21,162	62,766
Supplemental Data:
Cash interest paid	897,404	1,143,526
Income taxes paid, net	177,218	72,303
Notes payable issued to vendor for the purchase of equipment and other assets	$ 61,316	$ 86,132