v3.8.0.1
ASSETS HELD FOR SALE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems      
Net Revenues $ 0    
Station operating expenses 0    
Depreciation and amortization 0    
TBA income 415    
Total Operating Expenses 0    
Income before taxes 415    
Tax Expense attributable to Discontinued Operations 87    
Income from Discontinued Operations, Net of Tax 328    
Summary of the categories of property and equipment      
Property Plant And Equipment Net 347,045 $ 346,507  
IntangibleAssetsGrossExcludingGoodwillAbstract      
Net Assets Held for Sale 211,870 212,320  
Goodwill 859,051 862,000 $ 32,718
IntangibleAssetsNetIncludingGoodwill 160,534 160,534  
BonnevilleTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Net Assets Held for Sale 165,870 165,870  
IntangibleAssetsNetIncludingGoodwill 160,534 160,534  
OtherTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Net Assets Held for Sale 46,000 46,450  
IntangibleAssetsNetIncludingGoodwill 0 0  
Land and Land Improvements [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 47,110 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  
Land and Land Improvements [Member] | OtherTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 46,000 46,000  
Building [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 1,520 1,970  
Building [Member] | BonnevilleTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 1,520 1,520  
Building [Member] | OtherTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 0 450  
Leasehold improvements [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 88 88  
Leasehold improvements [Member] | BonnevilleTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 88 88  
Leasehold improvements [Member] | OtherTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 0 0  
Equipment [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 2,618 2,618  
Equipment [Member] | BonnevilleTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 2,618 2,618  
Equipment [Member] | OtherTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 0 0  
Property Plant and Equipment Net Member [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 51,336 51,786  
Property Plant and Equipment Net Member [Member] | BonnevilleTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 5,336 5,336  
Property Plant and Equipment Net Member [Member] | OtherTransactionMember [Member]      
Summary of the categories of property and equipment      
Property Plant And Equipment Net 46,000 46,450  
Radio Broadcasting Licences [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Radio broadcasting licenses 136,014 136,014  
Radio Broadcasting Licences [Member] | BonnevilleTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Radio broadcasting licenses 136,014 136,014  
Radio Broadcasting Licences [Member] | OtherTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Radio broadcasting licenses 0 0  
Other Intangibles      
IntangibleAssetsGrossExcludingGoodwillAbstract      
OtherIntangibleAssetsNet 1,947 1,947  
Other Intangibles | BonnevilleTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
OtherIntangibleAssetsNet 1,947 1,947  
Other Intangibles | OtherTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
OtherIntangibleAssetsNet 0 0  
Goodwill [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Goodwill 22,573 22,573  
Goodwill [Member] | BonnevilleTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Goodwill 22,573 22,573  
Goodwill [Member] | OtherTransactionMember [Member]      
IntangibleAssetsGrossExcludingGoodwillAbstract      
Goodwill $ 0 $ 0