SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) company item	Sep. 30, 2018 USD ($) company item	Dec. 31, 2017 USD ($)
Investments in Unconsolidated Companies Activity
Number of media companies | company	30	30
Number of states | item	14	14
Length of fiscal quarter	91 days	273 days
Long-term debt fair value disclosure
Estimated fair value of long-term debt			$ 810,700
Long-term debt	$ 638,651	$ 638,651	$ 781,392
9.00% senior secured notes due in 2026
Long-term debt fair value disclosure
Estimated fair value of long-term debt	314,300	314,300
Long-term debt	290,054	290,054
Debentures and Junior Term Loans
Long-term debt fair value disclosure
Estimated fair value of long-term debt	328,700	328,700
Long-term debt	$ 348,600	$ 348,600