Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property and equipment
Property and equipment excluding land gross	$ 227,400,000	$ 227,000,000
Less accumulated depreciation	173,400,000	169,200,000
Property and equipment excluding land, net	54,000,000	57,800,000
Land	7,400,000	7,400,000
Property and equipment, total	61,435,000	65,226,000
Building [Member]
Property and equipment
Property and equipment excluding land gross	18,600,000	18,500,000
Property and equipment, Estimated useful life	39 years
Construction in Progress [Member]
Property and equipment
Property and equipment excluding land gross	1,300,000	2,200,000
Transmission studio and other broadcast equipment [Member]
Property and equipment
Property and equipment excluding land gross	158,000,000	156,700,000
Office and computer equipment [Member]
Property and equipment
Property and equipment excluding land gross	21,000,000	22,500,000
Transportation equipment [Member]
Property and equipment
Property and equipment excluding land gross	6,300,000	6,000,000
Property and equipment, Estimated useful life	5 years
Leasehold improvements and land improvements [Member]
Property and equipment
Property and equipment excluding land gross	$ 22,200,000	$ 21,100,000
Property and equipment, Estimated useful life	Lesser of lease life or useful life
Maximum [Member] | Transmission studio and other broadcast equipment [Member]
Property and equipment
Property and equipment, Estimated useful life	15 years
Maximum [Member] | Office and computer equipment [Member]
Property and equipment
Property and equipment, Estimated useful life	7 years
Minimum [Member] | Transmission studio and other broadcast equipment [Member]
Property and equipment
Property and equipment, Estimated useful life	5 years
Minimum [Member] | Office and computer equipment [Member]
Property and equipment
Property and equipment, Estimated useful life	3 years