Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended													12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Income from discontinued operations, net of tax		$ (30)	$ 30,451	$ 1,159	$ 891		$ 1,588		$ 1,511		$ 1,166		$ 1,011		$ 32,471		$ 5,276	$ 4,268
Joplin, Missouri and Victoria, Texas Television Stations [Member]
Net operating revenue															14,238	[2]	23,636	21,064
Station operating expense	[3]														9,757	[2]	14,743	14,080
Other operating (income) expense															31	[2]	(42)	32
Operating income															4,450	[2]	8,935	6,952
Interest expense	[4]														21	[2]	32	33
Other income	[5]														0	[2]	0	(417)
Income before income taxes															4,429	[2]	8,903	7,336
Pretax gain on the disposal of discontinued operations															50,842	[2]	0	0
Total pretax gain on discontinued operations															55,271	[2]	8,903	7,336
Income tax expense	[6]														22,800	[2]	3,627	3,068
Income from discontinued operations, net of tax															$ 32,471	[2]	$ 5,276	$ 4,268

[1] Certain prior year amounts and March 31, 2017 quarterly data have been reclassified to conform with current presentation.

[2] Results of operations for the Television stations are reflected through August 31, 2017. The effective date of the sale was September 1, 2017.

[3] No depreciation expense was recorded by the Company beginning May 9, 2017, the date the Television segment assets’ were held for sale.

[4] Interest expense related to the Surtsey debt that is guaranteed by the Television stations. Our affiliate repaid this loan when the television stations were sold on September 1, 2017.

[5] Other income in 2015 relates to a gain on an insurance claim.

[6] The effective tax rates on pretax income from discontinued operations were approximately 41%.