Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule Of Significant Accounting Policies [Line Items]      
Contract with Customer, Liability, Current $ 12,165   $ 12,763
Contract with Customer, Refund Liability, Current 11,900   12,500
Revenue from Contract with Customer, Excluding Assessed Tax 0    
Contract with Customer, Refund Liability, Noncurrent 0   0
Contract with Customer, Liability, Revenue Recognized 3,500    
Contract with Customer, Refund Liability 1,600   $ 2,000
Prepaid commission expense 600    
Broadcasting [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Advertising Barter Transactions, Advertising Barter Revenue 1,700 $ 1,300  
Advertising Barter Transactions, Advertising Barter Costs 1,300 1,200  
Digital Media [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Advertising Barter Transactions, Advertising Barter Revenue 46,000,000 25,000,000  
Advertising Barter Transactions, Advertising Barter Costs $ 0 $ 75,000,000