SUMMARIZED QUARTERLY FINANCIAL DATA - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Earnings Per Share Basic [Abstract]
Income (Loss) from Continuing Operations, Per Outstanding Share, Total	$ 2.63	$ 0.11	$ 0.16	$ (0.24)	$ 0.3	$ 0.3	$ 0.28	$ 0.11					$ 4.49	$ 0.94	$ 0.75
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	0.01	0	0	0	0	0	0	0					0.02	0	0
Earnings Per Share Basic	2.63	0.09	0.15	(0.25)	0.28	0.28	0.27	0.1					4.51	0.94	0.75
Earnings Per Share Diluted Abstract
Income (Loss) from Continuing Operations, Per Diluted Share	2.58	0.28	0.26	0.11	0.28	0.28	0.26	0.11					4.37	0.91	0.73
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	0.01	0	0	0	0	0	0	0					0.02	0	0
Earnings Per Share Diluted	$ 2.59	$ 0.09	$ 0.15	$ (0.25)	$ 0.27	$ 0.28	$ 0.26	$ 0.1					$ 4.16	$ 0.91	$ 0.73
Quarterly Financial Information Disclosure Abstract
Sales Revenue, Net	$ 246,614	$ 122,299	$ 124,970	$ 99,001	$ 124,550	$ 121,641	$ 121,571	$ 97,009	$ 118,614	$ 115,536	$ 101,322	$ 79,009	$ 592,884	$ 464,771	$ 414,481
Operating Income Loss	$ (2,265)	$ 13,485	$ 16,379	$ (15,016)	$ 30,040	$ 25,688	$ 27,584	$ 14,745					$ 12,584	$ 98,057	$ 85,582
Weighted average basic common shares outstanding	88,309,000	38,955,000	38,945,000	38,910,000	38,561,000	38,485,000	38,469,000	38,448,000					51,392,899	38,500,495	38,083,947
Weighted Average Number Of Diluted Shares Outstanding	89,887,000	39,728,000	39,656,000	38,910,000	39,800,000	41,433,000	41,130,000	39,260,000					55,678,189	39,568,062	39,037,623
Changes in broadcasting licenses [Line Items]
Payments Of Dividends	$ 12,746	$ 10,713	$ 2,921	$ 2,916	$ 2,893	$ 2,887	$ 2,886	$ 0					$ (29,296)	$ (8,666)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	231,829	4,100	6,414	(9,331)	11,399	11,420	10,834	4,412					233,013	38,065	$ 29,184
Preferred stock dividend	252	663	550	550	550	526	412	413					2,015	1,901	752
Net Income (Loss) Available to Common Stockholders, Basic	231,577	3,437	5,864	(9,881)	10,849	10,894	10,422	3,999					230,998	36,164	28,432
Income Loss From Discontinued Operations Net Of Tax	836	0	0	0	0	0	0	0					836	0	0
Net Income (Loss) Attributable to Parent	232,413	3,437	5,864	(9,881)	10,849	10,894	10,422	3,999					233,849	38,065	29,184	$ 29,184
Payments of dividends on preferred stock	$ (924)	$ (550)	$ (550)	$ (550)	$ (550)	$ (413)	$ (413)	$ (412)					$ (2,574)	$ (1,788)	$ (413)