RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Programming liabilities		$ 12,264		$ 12,264		$ 20,027
Other accounts payable and accrued liabilities		143		143		252
Accrued interest payable		2,641		2,641		6,273
Other non-current liabilities		$ 104,097		$ 104,097		95,254
AT&T [Member]
Related Party Transaction [Line Items]
Ownership percentage, related party		44.70%		44.70%
Purchases of programming		$ 4,615	$ 3,716	$ 9,933	$ 7,192
Interest expense		6,508	$ 12,878	16,981	$ 27,253
Programming liabilities		12,264		12,264		20,027
Accrued interest payable	[1]	2,641		2,641		6,273
Other non-current liabilities	[2]	74,035		74,035		69,620
Accounts Payable [Member] | AT&T [Member]
Related Party Transaction [Line Items]
Other accounts payable and accrued liabilities		$ 143		$ 143		$ 252

[1] (1) Amount represents accrued Guarantee Fees for which we have not yet paid in cash or made an election to pay in kind. See Note 5, "Long-term Debt and Other Financing Arrangements".

[2] (2) Amount represents the Commitment Fee, as well as the Guarantee Fees for which we had previously made an election to pay in kind. See Note 5, "Long-term Debt and Other Financing Arrangements".