ASSETS HELD FOR SALE (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Net Revenues		$ 0
Station operating expenses		0
Depreciation and amortization		0
TBA income	$ 1,180	1,595
Total Operating Expenses		0
Income before taxes	1,180	1,595
Tax Expense attributable to Discontinued Operations	336	423
Income from Discontinued Operations, Net of Tax	844	1,172
Summary of the categories of property and equipment
Property Plant And Equipment Net	324,669	324,669	$ 346,507
IntangibleAssetsGrossExcludingGoodwillAbstract
Indefinite-lived Intangible Assets	2,662,042	2,662,042	2,649,959	$ 823,195
Net Assets Held for Sale	209,828	209,828	212,320
Goodwill	857,931	857,931	862,000	$ 32,718
IntangibleAssetsNetIncludingGoodwill	135,280	135,280	160,534
BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Net Assets Held for Sale	140,300	140,300	165,870
IntangibleAssetsNetIncludingGoodwill	135,280	135,280	160,534
OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Net Assets Held for Sale	69,528	69,528	46,450
IntangibleAssetsNetIncludingGoodwill	0	0	0
Other Miscellaneous markets [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Assets Held for Sale	23,500	23,500
Land and Land Improvements [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	67,522	67,522	47,110
Land and Land Improvements [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	1,110	1,110	1,110
Land and Land Improvements [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	66,412	66,412	46,000
Building [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	4,636	4,636	1,970
Building [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	1,520	1,520	1,520
Building [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	3,116	3,116	450
Leasehold improvements [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	78	78	88
Leasehold improvements [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	78	78	88
Leasehold improvements [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0	0	0
Equipment [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	2,312	2,312	2,618
Equipment [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	2,312	2,312	2,618
Equipment [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0	0	0
Property Plant and Equipment Net Member [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	74,548	74,548	51,786
Property Plant and Equipment Net Member [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	5,020	5,020	5,336
Property Plant and Equipment Net Member [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	69,528	69,528	46,450
Radio Broadcasting Licences [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Radio broadcasting licenses	111,854	111,854	136,014
Radio Broadcasting Licences [Member] | BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Radio broadcasting licenses	111,854	111,854	136,014
Radio Broadcasting Licences [Member] | OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Radio broadcasting licenses	0	0	0
Other Intangibles
IntangibleAssetsGrossExcludingGoodwillAbstract
OtherIntangibleAssetsNet	1,947	1,947	1,947
Other Intangibles | BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
OtherIntangibleAssetsNet	1,947	1,947	1,947
Other Intangibles | OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
OtherIntangibleAssetsNet	0	0	0
Goodwill [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Goodwill	21,479	21,479	22,573
Goodwill [Member] | BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Goodwill	21,479	21,479	22,573
Goodwill [Member] | OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Goodwill	$ 0	$ 0	$ 0