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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
12 Months Ended
Jul. 15, 2021
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
radioMarket
Nov. 17, 2017
radioMarket
Nov. 16, 2017
radioMarket
Variable Interest Entity [Line Items]            
Borrowing under the accounts receivable facility   $ 75,000,000 $ 0 $ 0    
Accounts receivable from securitization, maximum amount $ 75,000,000          
Accounts receivable, after allowance for credit loss   $ 276,044,000 276,102,000      
Number of reportable segments | segment   1        
Number of operating segments | segment   1        
Number of radio markets | radioMarket       47 48 28
Advertising cost incurred   $ 2,300,000 1,200,000 $ 7,100,000    
Capitalized computer software, amortization period   3 years        
Accounts receivable facility            
Variable Interest Entity [Line Items]            
Borrowing under the accounts receivable facility $ 75,000,000          
Accounts receivable, after allowance for credit loss   $ 239,500,000        
Carrying value of debt   $ 75,000,000 $ 0