Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Activity in the allowance for doubtful accounts

The activity in the allowance for doubtful accounts during the years ended December 31, 2012, 2011 and 2010 was as follows:

			Write Off of
	Balance	Charged to	Uncollectible	Balance at
	at Beginning	Costs and	Accounts, Net of	End of
Year Ended	of Period	Expenses	Recoveries	Period
	(In thousands)
December 31, 2012	$794	$134	$(351)	$577
December 31, 2011	$797	$526	$(529)	$794
December 31, 2010	$733	$560	$(496)	$797

Property and equipment

Property and equipment consisted of the following:

	Estimated		December 31,
	Useful Life		2012			2011
			(In thousands)
Land and land improvements		—	$	11,321		$	11,178
Buildings		31.5 years		32,367			31,741
Towers and antennae		7-15 years		25,687			25,582
Equipment		3-15 years		74,874			74,403
Furniture, fixtures and leasehold improvements		7-20 years		7,768			7,623
Vehicles		5 years		3,762			3,720
				155,779			154,247
Accumulated depreciation				(97,317	)		(93,625	)
Net property and equipment			$	58,462		$	60,622

Computation of basic and diluted earnings per share

The following table sets forth the computation of basic and diluted earnings per share:

	Years Ended December 31,
	2012		2011		2010
	(In thousands, except per share data)
Numerator:
Net income available to common stockholders	$	17,925	$	12,631	$	15,136
Denominator:
Denominator for basic earnings per share-weighted average shares		5,659		5,651		5,640
Effect of dilutive securities:
Stock options		13		5		1
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions		5,672		5,656		5,641
Basic earnings per share	$	3.17	$	2.24	$	2.68
Diluted earnings per share	$	3.16	$	2.23	$	2.68