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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies |
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, 2019, 2018 and 2017 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 31,2019 |  | $ | 759 |  | $ | 578 |  | $ | — |  | $ | (666) |  | $ | 671
December 31,2018 |  | $ | 727 |  | $ | 444 |  | $ | 25 |  | $ | (437) |  | $ | 759
December 31,2017 |  | $ | 518 |  | $ | 333 |  | $ | 181 |  | $ | (305) |  | $ | 727
Property and equipment | Property and equipment consisted of the following:
|  | Estimated |  | December 31,
|  | Useful Life |  | 2019 |  | 2018
|  |  |  | (In thousands)
Land and land improvements |  | — |  | $ | 14,693 |  | $ | 14,402
Buildings |  | 31.5 years |  |  | 37,984 |  |  | 35,812
Towers and antennae |  | 7-15 years |  |  | 24,762 |  |  | 25,959
Equipment |  | 3-15 years |  |  | 54,321 |  |  | 53,752
Furniture, fixtures and leasehold improvements |  | 7-20 years |  |  | 7,169 |  |  | 6,740
Vehicles |  | 5 years |  |  | 3,474 |  |  | 3,555
|  |  |  |  | 142,403 |  |  | 140,220
Accumulated depreciation |  |  |  |  | (83,692) |  |  | (81,117)
Net property and equipment |  |  |  | $ | 58,711 |  | $ | 59,103
Schedule of 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,
|  | 2019 |  | 2018 |  | 2017
|  | (In thousands, except per share data)
Numerator: |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 13,279 |  | $ | 13,690 |  | $ | 22,246
Less: Income allocated to unvested participating securities |  |  | 292 |  |  | 256 |  |  | 370
Income from continuing operations available to common stockholders |  | $ | 12,987 |  | $ | 13,434 |  | $ | 21,876
Income from discontinued operations |  | $ | — |  | $ | — |  | $ | 32,471
Less: Income allocated to unvested participating securities |  |  | — |  |  | — |  |  | 541
Income from discontinued operations available to common stockholders |  | $ | — |  | $ | — |  | $ | 31,930
Net income available to common stockholders |  | $ | 12,987 |  | $ | 13,434 |  | $ | 53,806
Denominator: |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share-weighted average shares |  |  | 5,834 |  |  | 5,829 |  |  | 5,803
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  | — |  |  | 4
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions |  |  | 5,834 |  |  | 5,829 |  |  | 5,807
Basic earnings per share: |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 2.23 |  | $ | 2.30 |  | $ | 3.77
From discontinued operations |  |  | — |  |  | — |  |  | 5.50
Basic earnings per share |  | $ | 2.23 |  | $ | 2.30 |  | $ | 9.27
Diluted earnings per share |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 2.23 |  | $ | 2.30 |  | $ | 3.77
From discontinued operations |  |  | — |  |  | — |  |  | 5.50
Diluted earnings per share |  | $ | 2.23 |  | $ | 2.30 |  | $ | 9.27

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