SEGMENT DATA - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) market	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2018 market
Segment data
Number of markets | market	89
Intersegment Loans | $	$ 155.8	$ 159.8
Intersegment Interest Expense | $	$ 15.3	$ 18.5	$ 24.4
Operating segments | Broadcast
Segment data
Number of markets | market				89