SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Non-Cash Investing and Financing Activities:
Property and equipment accrued but unpaid	$ 219,889	$ 158,025
Notes payable issued to vendor for the purchase of equipment and other assets	0	16,266
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	27,674	4,970
Deferred financing costs accrued but unpaid	0	1,663
Supplemental Data:
Interest Paid, Excluding Capitalized Interest, Operating Activities	474,268	475,109
Income taxes paid, net	1,195	110
Noncash contribution from parent	150,602	0
Unsettled Treasury Shares	23,993	13,242
CSC Holdings
Supplemental Data:
Interest Paid, Excluding Capitalized Interest, Operating Activities	474,268	455,974
Income taxes paid, net	$ 1,195	$ 110