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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property and equipment        
Property and equipment, gross $ 1,304,481 $ 1,304,481 $ 1,273,055  
Less: accumulated depreciation (587,344) (587,344) (520,517)  
Property, Plant and Equipment, Net, Total 717,137 717,137 752,538  
Capital lease additions 2,800 2,800 0 $ 10,400
Capital lease depreciation expense   3,900 3,700 $ 4,000
Land and improvements        
Property and equipment        
Property and equipment, gross 60,678 60,678 55,269  
Real estate held for development and sale        
Property and equipment        
Property and equipment, gross 91,106 91,106 113,514  
Buildings and improvements        
Property and equipment        
Property and equipment, gross 210,597 $ 210,597 192,478  
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 667,454 $ 667,454 684,176  
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 85,411 $ 85,411 70,402  
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 22,693 $ 22,693 19,091  
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 47,402 $ 47,402 37,726  
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 84,474 $ 84,474 81,625  
Capital leased assets | Minimum        
Property and equipment        
Estimated useful lives   0 years    
Capital leased assets | Maximum        
Property and equipment        
Estimated useful lives   0 years    
Construction in progress        
Property and equipment        
Property and equipment, gross $ 34,666 $ 34,666 $ 18,774