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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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