Leases (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Future minimum lease payments under capital leases
2016	$ 2,163,000
2017	2,160,000
2018	2,160,000
2019	2,070,000
Total	8,553,000
Less amount representing interest (at implicit rates of 9.38% and 3.31% )	(1,430,000)
Present value of net minimum lease payments	7,123,000
Less current maturities	(1,561,000)
Long term obligation	$ 5,562,000
Implicit interest rate, one (as a percent)	9.38%
Implicit interest rate, two (as a percent)	3.31%
Future minimum lease payments under operating leases
2016	$ 4,205,000
2017	4,972,000
2018	5,135,000
2019	5,122,000
2020	3,592,000
Thereafter	11,354,000
Total	$ 34,380,000
Leases, additional disclosure
Number of capital lease obligations | item	3
Rent expense under operating leases	$ 4,300,000	$ 4,400,000	$ 3,700,000
Revenue from sale of excess digital network capacity on transponder leased	262,000	$ 262,000	$ 262,000
Parking spaces for the Studio City, California, office
Future minimum lease payments under operating leases
2016	130,000
2017	130,000
2018	130,000
2019	130,000
2020	$ 97,000