RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Programming liabilities		$ 12,959		$ 12,171
Other accounts payable and accrued liabilities		280		292
Accrued interest payable		5,759		1,749
Other non-current liabilities		$ 81,526		67,293
AT&T [Member]
Related Party Transaction [Line Items]
Ownership percentage, related party		44.40%
Purchases of programming		$ 4,976	$ 6,002
Interest expense		4,754	$ 12,516
Programming liabilities		12,959		12,171
Accrued interest payable	[1]	5,759		1,749
Other non-current liabilities	[2]	33,465		33,465
Accounts Payable [Member] | AT&T [Member]
Related Party Transaction [Line Items]
Other accounts payable and accrued liabilities		$ 280		$ 292

[1] (1) Amount represents accrued Guarantee Fees for which we have not yet paid. See Note 4, "Long-term Debt and Other Financing Arrangements".

[2] (2) Amount represents Guarantee Fees for which we had previously made an election to pay in kind.