ASSETS HELD FOR SALE (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Net Revenues			$ 0
Station operating expenses			0
Depreciation and amortization			0
TBA income	$ 644		2,239
Total Operating Expenses			0
Income before taxes	644		2,239
Tax Expense attributable to Discontinued Operations	286		709
Income from Discontinued Operations, Net of Tax	358		1,530
Summary of the categories of property and equipment
Property Plant And Equipment Net	328,041		328,041	$ 346,507
IntangibleAssetsGrossExcludingGoodwillAbstract
Net Assets Held for Sale	3,639		3,639	212,320
Goodwill	871,454		871,454	862,000
IntangibleAssetsNetIncludingGoodwill	0		0	160,534
BonnevilleTransactionMember [Member]
Assets Held-for-sale, at Carrying Value1 [Abstract]
ProceedsFromDivestitureOfBusinesses		$ 140,300
IntangibleAssetsGrossExcludingGoodwillAbstract
Net Assets Held for Sale	0		0	165,870
ProceedsFromDivestitureOfBusinesses		140,300
Gain Loss On Sale Of Business		400
IntangibleAssetsNetIncludingGoodwill	0		0	160,534
OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Net Assets Held for Sale	3,639		3,639	46,450
IntangibleAssetsNetIncludingGoodwill	0		0	0
Other Miscellaneous markets [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Assets Held for Sale	23,500		23,500
ChicagoLandSale [Member]
Assets Held-for-sale, at Carrying Value1 [Abstract]
ProceedsFromDivestitureOfBusinesses		46,000
IntangibleAssetsGrossExcludingGoodwillAbstract
ProceedsFromDivestitureOfBusinesses		46,000
Gain Loss On Sale Of Business		100
SanDiegoAndLosAngelesSale [Member]
Assets Held-for-sale, at Carrying Value1 [Abstract]
ProceedsFromDivestitureOfBusinesses		27,200
IntangibleAssetsGrossExcludingGoodwillAbstract
ProceedsFromDivestitureOfBusinesses		27,200
Gain Loss On Sale Of Business		$ 6,400
Land and Land Improvements [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	2,433		2,433	47,110
Land and Land Improvements [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0		0	1,110
Land and Land Improvements [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	2,433		2,433	46,000
Building [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	1,206		1,206	1,970
Building [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0		0	1,520
Building [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	1,206		1,206	450
Leasehold improvements [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0		0	88
Leasehold improvements [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0		0	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	0		0	2,618
Equipment [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0		0	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	3,639		3,639	51,786
Property Plant and Equipment Net Member [Member] | BonnevilleTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	0		0	5,336
Property Plant and Equipment Net Member [Member] | OtherTransactionMember [Member]
Summary of the categories of property and equipment
Property Plant And Equipment Net	3,639		3,639	46,450
Radio Broadcasting Licences [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Radio broadcasting licenses	0		0	136,014
Radio Broadcasting Licences [Member] | BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Radio broadcasting licenses	0		0	136,014
Radio Broadcasting Licences [Member] | OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Radio broadcasting licenses	0		0	0
Other Intangibles
IntangibleAssetsGrossExcludingGoodwillAbstract
OtherIntangibleAssetsNet	0		0	1,947
Other Intangibles | BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
OtherIntangibleAssetsNet	0		0	1,947
Other Intangibles | OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
OtherIntangibleAssetsNet	0		0	0
Goodwill [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Goodwill	0		0	22,573
Goodwill [Member] | BonnevilleTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Goodwill	0		0	22,573
Goodwill [Member] | OtherTransactionMember [Member]
IntangibleAssetsGrossExcludingGoodwillAbstract
Goodwill	$ 0		$ 0	$ 0