Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Activity in the allowance for doubtful accounts

A provision for doubtful accounts is recorded based on our judgment of the collectability of receivables. Amounts are written off when determined to be fully uncollectible. Delinquent accounts are based on contractual terms. The activity in the allowance for doubtful accounts during the years ended December 31, 2018, 2017 and 2016 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, 2018	$	727	$	444	$	25	$	(437	)	$	759
December 31, 2017	$	518	$	333	$	181	$	(305	)	$	727
December 31, 2016	$	614	$	195	$	—	$	(291	)	$	518

Property and equipment

Property and equipment consisted of the following:

	Estimated		December 31,
	Useful Life		2018			2017
			(In thousands)

Land and land improvements		—	$	14,402		$	13,594
Buildings		31.5 years		35,812			34,905
Towers and antennae		7-15 years		25,959			24,538
Equipment		3-15 years		53,752			52,534
Furniture, fixtures and leasehold improvements		7-20 years		6,740			6,822
Vehicles		5 years		3,555			3,463
				140,220			135,856
Accumulated depreciation				(81,117	)		(79,621	)
Net property and equipment			$	59,103		$	56,235

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,
	2018		2017		2016
	(In thousands, except per share data)

Numerator:
Income from continuing operations	$	13,690	$	22,246	$	12,910
Less: Income allocated to unvested participating securities		256		370		231
Income from continuing operations available to common stockholders	$	13,434	$	21,876	$	12,679

Income from discontinued operations	$	—	$	32,471	$	5,276
Less: Income allocated to unvested participating securities		—		541		94
Income from discontinued operations available to common stockholders	$	—	$	31,930	$	5,182

Net income available to common stockholders	$	13,434	$	53,806	$	17,861

Denominator:
Denominator for basic earnings per share-weighted average shares		5,829		5,803		5,761
Effect of dilutive securities:
Stock options		—		4		10
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions		5,829		5,807		5,771

Basic earnings per share:
From continuing operations	$	2.30	$	3.77	$	2.20
From discontinued operations		—		5.50		0.90
Basic earnings per share	$	2.30	$	9.27	$	3.10

Diluted earnings per share
From continuing operations	$	2.30	$	3.77	$	2.19
From discontinued operations		—		5.50		0.90
Diluted earnings per share	$	2.30	$	9.27	$	3.09