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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property and equipment      
Property and equipment, gross $ 1,402,735 $ 1,304,481  
Less: accumulated depreciation (685,159) (587,344)  
Property, Plant and Equipment, Net, Total 717,576 717,137  
Capital lease depreciation expense 4,200 3,900 $ 3,700
Land and improvements      
Property and equipment      
Property and equipment, gross 73,124 60,678  
Real estate held for development and sale      
Property and equipment      
Property and equipment, gross 90,087 91,106  
Buildings and improvements      
Property and equipment      
Property and equipment, gross $ 239,603 210,597  
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 $ 702,004 667,454  
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 $ 101,252 85,411  
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 $ 24,762 22,693  
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 $ 56,507 47,402  
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 $ 84,516 84,474  
Construction in progress      
Property and equipment      
Property and equipment, gross $ 30,880 $ 34,666