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ACQUISITIONS AND DISPOSITIONS (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 03, 2017
May 02, 2017
Apr. 28, 2017
Apr. 20, 2017
Jan. 30, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                      
Proceeds from Divestiture of Businesses $ 2,000,000       $ 25,000,000            
Assets Held-for-sale, Not Part of Disposal Group                     $ 2,200,000
Sale Leaseback Transaction, Net Proceeds, Investing Activities   $ 25,000,000             $ 25,000,000 $ 0  
Sale And Leaseback Transaction Gain   $ 22,500,000                  
Sale and Leaseback Transaction, Gain (Loss), Net           $ 0 $ 14,400,000 $ 0 $ 14,411,000 $ 0  
Sale Lease Back Transaction, Lease Expiration Period                 10 years    
Goodwill           263,310,000     $ 263,310,000   $ 258,284,000
Deferred Gain (loss) on Bussiness Combination           $ 8,100,000     $ 8,100,000    
Red Zebra Broadcasting [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total       $ 206,000              
Business Acquisition Purchase Price Allocation Indefinite Lived Intangible Assets, Radio Broadcasting Licenses       1,600,000              
Business Acquisition Purchase Price Allocation Indefinite Lived Intangible Assets Including Goodwill       47,000              
Business Combination, Consideration Transferred       2,000,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Intangible Assets       $ 114,000              
Moguldom Media Group, LLC. [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total     $ 22,000                
Business Combination, Consideration Transferred     5,000,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Intangible Assets     347,000                
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Brand and Trade Names     915,000                
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Customer Relationship     1,200,000                
Business Combination, Contingent Consideration, Liability     2,200,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other     263,000                
Goodwill     $ 5,000,000