Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Activity in the allowance for doubtful accounts

The activity in the allowance for doubtful accounts during the years ended December 31, 2017, 2016 and 2015 was as follows:

							Write Off of
	Balance		Charged to		Allowance		Uncollectible		Balance at
	at Beginning		Costs and		From		Accounts, Net of		End of
Year Ended	of Period		Expenses		Acquisitions		Recoveries		Period
	(in thousands)
December 31, 2017	$	518	$	333	$	181	$	(305)	$	727
December 31, 2016	$	614	$	195	$	—	$	(291)	$	518
December 31, 2015	$	378	$	294	$	99	$	(157)	$	614

Property and equipment

Property and equipment consisted of the following:

	Estimated		December 31,
	Useful Life		2017		2016
			(In thousands)
Land and land improvements		—	$	13,594	$	12,307
Buildings		31.5 years		34,905		32,046
Towers and antennae		7-15 years		24,538		23,066
Equipment		3-15 years		52,534		56,745
Furniture, fixtures and leasehold improvements		7-20 years		6,822		7,261
Vehicles		5 years		3,463		3,255
				135,856		134,680
Accumulated depreciation				(79,621)		(85,506)
Net property and equipment			$	56,235	$	49,174

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,
	2017		2016		2015
	(In thousands, except per share data)
Numerator:
Income from continuing operations	$	22,246	$	12,910	$	9,146
Less: Income allocated to unvested participating securities		370		231		171
Income from continuing operations available to common stockholders	$	21,876	$	12,679	$	8,975
Income from discontinued operations	$	32,471	$	5,276	$	4,268
Less: Income allocated to unvested participating securities		541		94		80
Income from discontinued operations available to common stockholders	$	31,930	$	5,182	$	4,188
Net income available to common stockholders	$	53,806	$	17,861	$	13,163
Denominator:
Denominator for basic earnings per share-weighted average shares		5,803		5,761		5,706
Effect of dilutive securities:
Stock options		4		10		34
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions		5,807		5,771		5,740
Basic earnings per share:
From continuing operations	$	3.77	$	2.20	$	1.58
From discontinued operations		5.50		0.90		0.73
Basic earnings per share	$	9.27	$	3.10	$	2.31
Diluted earnings per share
From continuing operations	$	3.77	$	2.19	$	1.56
From discontinued operations		5.50		0.90		0.73
Diluted earnings per share	$	9.27	$	3.09	$	2.29