Restatement of Financial Statements (Impact of Restatement on Consolidated Statements of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total net operating revenue	$ 47,115	$ 51,169	$ 93,704	$ 100,622
Other production, distribution and operating costs	23,845	22,833	46,029	45,847
Amortization	140	200	216	400
Total operating costs and expense	24,260	52,536	74,777	108,206
Operating income	22,855	(1,367)	18,927	(7,584)
Other income, net	1,133	891	1,962	1,779
Income Before Income Taxes	23,988	(476)	20,889	(5,805)
Income tax provision	7,460	58	6,496	(1,257)
Net Income	$ 16,528	$ (534)	$ 14,393	$ (4,548)
Net income basic and diluted	$ 0.77	$ (0.03)	$ 0.67	$ (0.21)
Advertising And Marketing Services [Member]
Total net operating revenue	$ 25,300	$ 26,397	$ 49,341	$ 52,138
Previously Reported [Member]
Total net operating revenue	47,735		94,324
Other production, distribution and operating costs	24,465		46,649
Amortization	200		400
Total operating costs and expense	24,940		75,581
Operating income	22,795		18,743
Other income, net	1,161		2,058
Income Before Income Taxes	23,956		20,801
Income tax provision	7,095		6,952
Net Income	$ 16,861		$ 13,849
Net income basic and diluted	$ 0.78		$ 0.64
Previously Reported [Member] | Advertising And Marketing Services [Member]
Total net operating revenue	$ 25,920		$ 49,961
Adjustment [Member]
Total net operating revenue	(620)		(620)
Other production, distribution and operating costs	(620)		(620)
Amortization	(60)		(184)
Total operating costs and expense	(680)		(804)
Operating income	60		184
Other income, net	(28)		(96)
Income Before Income Taxes	32		88
Income tax provision	365		(456)
Net Income	$ (333)		$ 544
Net income basic and diluted	$ (0.01)		$ 0.03
Adjustment [Member] | Advertising And Marketing Services [Member]
Total net operating revenue	$ (620)		$ (620)