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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property and equipment      
Property and equipment, gross $ 1,453,265 $ 1,486,637  
Less: accumulated depreciation (770,131) (748,339)  
Total property and equipment, net 683,134 738,298  
Capital lease depreciation expense 3,100 4,200 $ 4,200
Land and improvements      
Property and equipment      
Property and equipment, gross 76,501 77,487  
Real estate held for development and sale      
Property and equipment      
Property and equipment, gross 34,645 87,056  
Buildings and improvements      
Property and equipment      
Property and equipment, gross $ 278,649 260,470  
Buildings and improvements | Minimum      
Property and equipment      
Estimated useful lives 10 years    
Buildings and improvements | Maximum      
Property and equipment      
Estimated useful lives 30 years    
Station equipment      
Property and equipment      
Property and equipment, gross $ 744,294 779,779  
Station equipment | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Station equipment | Maximum      
Property and equipment      
Estimated useful lives 10 years    
Office furniture and equipment      
Property and equipment      
Property and equipment, gross $ 107,536 109,632  
Office furniture and equipment | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Office furniture and equipment | Maximum      
Property and equipment      
Estimated useful lives 10 years    
Leasehold improvements      
Property and equipment      
Property and equipment, gross $ 24,115 25,120  
Leasehold improvements | Minimum      
Property and equipment      
Estimated useful lives 10 years    
Leasehold improvements | Maximum      
Property and equipment      
Estimated useful lives 30 years    
Automotive equipment      
Property and equipment      
Property and equipment, gross $ 62,663 63,513  
Automotive equipment | Minimum      
Property and equipment      
Estimated useful lives 3 years    
Automotive equipment | Maximum      
Property and equipment      
Estimated useful lives 5 years    
Capital leased assets      
Property and equipment      
Property and equipment, gross $ 53,401 53,005  
Construction in progress      
Property and equipment      
Property and equipment, gross $ 71,461 $ 30,575