SEGMENT DATA Revenue by Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 228,251	$ 137,038	$ 181,908	$ 156,709	$ 221,280	$ 132,304	$ 165,339	$ 123,945	$ 703,906	$ 642,868	$ 583,006
Television advertising [Member]
Segment Reporting Information [Line Items]
Total net revenues									562,450	523,516	483,504
Carriage fees and subscriptions [Member]
Segment Reporting Information [Line Items]
Total net revenues									113,746	95,823	76,045
Other revenue [Member]
Segment Reporting Information [Line Items]
Total net revenues									$ 27,710	$ 23,529	$ 23,457