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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming (Details) - Television programming contract rights
 9 Months Ended
Sep. 30, 2020
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Television programming contract period 1 year
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Television programming contract period 7 years
Contract period utilizing accelerated amortization method 3 years