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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Feb. 08, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
May 17, 2022
USD ($)
Mar. 27, 2020
USD ($)
Subsequent Event [Line Items]                      
Number of reportable segments | segment         3            
Employer social security payments, deferred payment, CARES Act               $ 29,300,000      
Refundable payroll tax credit, CARES Act                     $ 12,400,000
Refundable payroll tax credit received, CARES Act           $ 7,900,000 $ 3,800,000 $ 700,000      
Goodwill impairment     $ 0 $ 595,500,000 $ 595,461,000 0 0        
Cash and cash equivalents     346,382,000   346,382,000 336,236,000     $ 346,382,000    
Total available liquidity amount     $ 772,100,000   $ 772,100,000       $ 772,100,000    
Indefinite-lived intangible asset, direct valuation method, period         10 years            
Media representation contracts term         10 years            
Advertising expenses         $ 233,900,000 166,100,000 166,100,000        
Advertising expense, barter costs         $ 210,200,000 138,300,000 130,100,000        
Subsequent Event | BMI                      
Subsequent Event [Line Items]                      
Cash proceeds from sale of equity interest $ 101,400,000                    
Computer equipment and software                      
Subsequent Event [Line Items]                      
Estimate useful lives     3 years   3 years       3 years    
Minimum | Buildings and improvements                      
Subsequent Event [Line Items]                      
Estimate useful lives     10 years   10 years       10 years    
Minimum | Towers, transmitters and studio equipment                      
Subsequent Event [Line Items]                      
Estimate useful lives     5 years   5 years       5 years    
Minimum | Furniture and other equipment                      
Subsequent Event [Line Items]                      
Estimate useful lives     5 years   5 years       5 years    
Maximum | Buildings and improvements                      
Subsequent Event [Line Items]                      
Estimate useful lives     39 years   39 years       39 years    
Maximum | Towers, transmitters and studio equipment                      
Subsequent Event [Line Items]                      
Estimate useful lives     40 years   40 years       40 years    
Maximum | Furniture and other equipment                      
Subsequent Event [Line Items]                      
Estimate useful lives     7 years   7 years       7 years    
Subsidiaries | Revolving Credit Facility | Asset-based Revolving Credit Facility Due 2027 | Line of Credit                      
Subsequent Event [Line Items]                      
Debt instrument, face amount     $ 450,000,000   $ 450,000,000       $ 450,000,000    
Maximum borrowing capacity     450,000,000   450,000,000       450,000,000 $ 450,000,000  
Outstanding borrowings under facility     0   0       0    
Letters of credit outstanding     24,300,000   24,300,000       24,300,000    
Borrowing base availability     425,700,000   $ 425,700,000       425,700,000    
Licensing Agreements                      
Subsequent Event [Line Items]                      
Goodwill impairment   $ 0         $ 0        
Non-cash impairment charge of intangible assets     $ 0 $ 363,600,000   $ 302,100,000     $ 1,200,000,000