Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS (Details Textual)

v3.8.0.1
RELATED PARTY TRANSACTIONS (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 20, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]        
Operating Leases, Rent Expense   $ 15,500,000 $ 15,300,000 $ 14,800,000
Related Party Annual Payments For Insurance Premiums     386,000  
Net Assets   2,800,000 2,600,000 2,500,000
Business Combination, Consideration Transferred   4,043,000 10,120,000  
Related Party Transaction, Amounts of Transaction   500,000    
Split-Dollar Life Insurance [Member]        
Related Party Transaction [Line Items]        
Business Combination, Consideration Transferred   1,400,000 1,000,000 600,000
Trust [Member] | Chief Executive Officer [Member]        
Related Party Transaction [Line Items]        
Operating Leases, Rent Expense   191,000 185,000 180,000
Know the Truth [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Other Revenues from Transactions with Related Party   1,200,000 400,000 400,000
Accounts Receivable, Related Parties   700,000 200,000  
Chairman And Chief Executive Officer [Member] | Land and Building [Member]        
Related Party Transaction [Line Items]        
Operating Leases, Rent Expense   1,500,000 1,500,000 1,300,000
Truth For Life [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Other Revenues from Transactions with Related Party   2,100,000 2,200,000 2,200,000
Accounts Receivable, Related Parties   200,000 200,000  
Edward G. Atsinger III, Chief Executive Officer and Director [Member]        
Related Party Transaction [Line Items]        
Operating Leases, Rent Expense   217,000 301,000 $ 133,000
The Truth Network [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction     11,000  
Accounts Receivable, Related Parties   3,000 $ 4,000  
AM 570, LLC [Member]        
Related Party Transaction [Line Items]        
Business Combination, Consideration Transferred $ 600,000      
Delmarva Educational Association Corporation [Member]        
Related Party Transaction [Line Items]        
Business Combination, Consideration Transferred   $ 21,000