Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 155,779	$ 154,247
Accumulated depreciation	(97,317)	(93,625)
Net property and equipment	58,462	60,622
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	11,321	11,178
Estimated Useful Life	0 years
Building [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	32,367	31,741
Estimated Useful Life	31 years 6 months
Towers and Antennae [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	25,687	25,582
Towers and Antennae [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Towers and Antennae [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	74,874	74,403
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Furniture Fixtures and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	7,768	7,623
Furniture Fixtures and Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	20 years
Furniture Fixtures and Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 3,762	$ 3,720
Estimated Useful Life	5 years