Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income from discontinued operations, net of tax	$ 0	$ 0	$ 32,471
Joplin, Missouri and Victoria, Texas Television Stations [Member]
Net operating revenue	0	0	14,238
Station operating expense	0	0	9,757
Other operating (income) expense	0	0	31
Operating income	0	0	4,450
Interest expense	0	0	21
Income before income taxes	0	0	4,429
Pretax gain on the disposal of discontinued operations	0	0	50,842
Total pretax gain on discontinued operations	0	0	55,271
Income tax expense	0	0	22,800
Income from discontinued operations, net of tax	$ 0	$ 0	$ 32,471