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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
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 |

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