Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary of property and equipment
Property and equipment, Gross	$ 88,141	$ 102,050
Less accumulated depreciation	(61,735)	(71,590)
Property and equipment, Net	26,406	30,460
Land
Summary of property and equipment
Property and equipment, Gross	6,456	7,306
Building and building improvements
Summary of property and equipment
Property and equipment, Gross	$ 22,161	36,721
Building and building improvements | Minimum
Summary of property and equipment
Property and Equipment, Estimated useful lives	7 years
Building and building improvements | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	20 years
Tower and antenna systems
Summary of property and equipment
Property and equipment, Gross	$ 5,986	5,978
Tower and antenna systems | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	10 years
Studio and technical equipment
Summary of property and equipment
Property and equipment, Gross	$ 25,416	24,938
Studio and technical equipment | Minimum
Summary of property and equipment
Property and Equipment, Estimated useful lives	5 years
Studio and technical equipment | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	10 years
Furniture and fixtures
Summary of property and equipment
Property and equipment, Gross	$ 4,819	4,946
Furniture and fixtures | Minimum
Summary of property and equipment
Property and Equipment, Estimated useful lives	5 years
Furniture and fixtures | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	10 years
Transmitter equipment
Summary of property and equipment
Property and equipment, Gross	$ 9,108	9,062
Transmitter equipment | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	10 years
Leasehold improvements
Summary of property and equipment
Property and equipment, Gross	$ 2,781	2,772
Leasehold improvements | Minimum
Summary of property and equipment
Property and Equipment, Estimated useful lives	1 year
Leasehold improvements | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	20 years
Computer equipment and software
Summary of property and equipment
Property and equipment, Gross	$ 9,362	8,382
Computer equipment and software | Minimum
Summary of property and equipment
Property and Equipment, Estimated useful lives	3 years
Computer equipment and software | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	5 years
Other
Summary of property and equipment
Property and equipment, Gross	$ 2,052	$ 1,945
Other | Minimum
Summary of property and equipment
Property and Equipment, Estimated useful lives	3 years
Other | Maximum
Summary of property and equipment
Property and Equipment, Estimated useful lives	5 years