v3.10.0.1
ASSETS HELD FOR SALE (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems                      
Revenues $ 411,375 $ 378,508 $ 372,124 $ 300,560 $ 246,614 $ 122,299 $ 124,970 $ 99,001 $ 1,462,567 $ 592,884 $ 464,771
Net Revenues                 0 5,494 0
Station operating expenses                 0 4,749 0
Depreciation and amortization                 0 9 0
TBA income                 1,765 652 0
Total Operating Expenses                 0 4,106 0
Income before taxes                 1,765 1,388 0
Tax Expense attributable to Discontinued Operations                 613 552 0
Income from Discontinued Operations, Net of Tax                 1,152 836 $ 0
Summary of the categories of property and equipment                      
Property, Plant and Equipment, Gross 459,613       461,131       459,613 461,131  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 158,341       132,209       158,341 132,209  
Property Plant And Equipment Net 317,030       346,507       317,030 346,507  
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Net Assets Held for Sale 19,603       212,320       19,603 212,320  
Goodwill 539,469       862,000       539,469 862,000  
IntangibleAssetsNetIncludingGoodwill 0       160,534       0 160,534  
BonnevilleTransactionMember [Member]                      
Assets Held-for-sale, at Carrying Value1 [Abstract]                      
ProceedsFromDivestitureOfBusinesses                 140,300    
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Net Assets Held for Sale 0       165,870       0 165,870  
ProceedsFromDivestitureOfBusinesses                 140,300    
Gain Loss On Sale Of Business                 200    
IntangibleAssetsNetIncludingGoodwill 0       160,534       0 160,534  
OtherTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Net Assets Held for Sale 19,603       46,450       19,603 46,450  
IntangibleAssetsNetIncludingGoodwill 0       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    
Austin Dallas and Sacramento Sale [Member]                      
Assets Held-for-sale, at Carrying Value1 [Abstract]                      
ProceedsFromDivestitureOfBusinesses                 3,900    
IntangibleAssetsGrossExcludingGoodwillAbstract                      
ProceedsFromDivestitureOfBusinesses                 3,900    
Gain Loss On Sale Of Business                 300    
Land and Land Improvements [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 2,645       47,110       2,645 47,110  
Land and Land Improvements [Member] | BonnevilleTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 0       1,110       0 1,110  
Land and Land Improvements [Member] | OtherTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 2,645       46,000       2,645 46,000  
Building [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 1,053       1,970       1,053 1,970  
Building [Member] | BonnevilleTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 0       1,520       0 1,520  
Building [Member] | OtherTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 1,053       450       1,053 450  
Leasehold improvements [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 0       88       0 88  
Leasehold improvements [Member] | BonnevilleTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 0       88       0 88  
Leasehold improvements [Member] | OtherTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 0       0       0 0  
Equipment [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 15,905       2,618       15,905 2,618  
Equipment [Member] | BonnevilleTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 0       2,618       0 2,618  
Equipment [Member] | OtherTransactionMember [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 15,905       0       15,905 0  
Property Plant and Equipment Net Member [Member]                      
Summary of the categories of property and equipment                      
Property Plant And Equipment Net 19,603       51,786       19,603 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       5,336       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 19,603       46,450       19,603 46,450  
Radio Broadcasting Licences [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Radio broadcasting licenses 0       136,014       0 136,014  
Radio Broadcasting Licences [Member] | BonnevilleTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Radio broadcasting licenses 0       136,014       0 136,014  
Radio Broadcasting Licences [Member] | OtherTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Radio broadcasting licenses 0       0       0 0  
Other Intangibles                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
OtherIntangibleAssetsNet 0       1,947       0 1,947  
Other Intangibles | BonnevilleTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
OtherIntangibleAssetsNet 0       1,947       0 1,947  
Other Intangibles | OtherTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
OtherIntangibleAssetsNet 0       0       0 0  
Goodwill [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Goodwill 0       22,573       0 22,573  
Goodwill [Member] | BonnevilleTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Goodwill 0       22,573       0 22,573  
Goodwill [Member] | OtherTransactionMember [Member]                      
IntangibleAssetsGrossExcludingGoodwillAbstract                      
Goodwill $ 0       $ 0       $ 0 $ 0