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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Activity in the allowance for doubtful accounts | The activity in the allowance for doubtful accounts during the years ended December 31, 2016, 2015 and 2014 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, 2016 |  | $ | 664 |  | $ | 206 |  | $ | — |  | $ | (310) |  | $ | 560 |
December 31, 2015 |  | $ | 395 |  | $ | 339 |  | $ | 99 |  | $ | (169) |  | $ | 664 |
December 31, 2014 |  | $ | 578 |  | $ | 139 |  | $ | — |  | $ | (322) |  | $ | 395 |
Property and equipment | Property and equipment consisted of the following:
|  | Estimated |  | December 31, |
|  | Useful Life |  | 2016 |  | 2015 |
|  |  |  | (In thousands) |
Land and land improvements |  |  | — |  | $ | 13,206 |  | $ | 13,207 |
Buildings |  |  | 31.5 years |  |  | 34,790 |  |  | 34,543 |
Towers and antennae |  |  | 7-15 years |  |  | 27,081 |  |  | 27,616 |
Equipment |  |  | 3-15 years |  |  | 73,287 |  |  | 79,624 |
Furniture, fixtures and leasehold improvements |  |  | 7-20 years |  |  | 7,776 |  |  | 8,263 |
Vehicles |  |  | 5 years |  |  | 3,828 |  |  | 3,821 |
|  |  |  |  |  | 159,968 |  |  | 167,074 |
Accumulated depreciation |  |  |  |  |  | (103,406) |  |  | (108,943) |
Net property and equipment |  |  |  |  | $ | 56,562 |  | $ | 58,131 |
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, |
|  | 2016 |  | 2015 |  | 2014 |
|  | (In thousands, except per share data) |
Numerator: |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 18,186 |  | $ | 13,414 |  | $ | 14,904 |
Less: Net income allocated to unvested participating securities |  |  | 325 |  |  | 250 |  |  | 234 |
Net income available to common stockholders |  | $ | 17,861 |  | $ | 13,164 |  | $ | 14,670 |
Denominator: |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share-weighted average shares |  |  | 5,761 |  |  | 5,706 |  |  | 5,700 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 10 |  |  | 34 |  |  | 53 |
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions |  |  | 5,771 |  |  | 5,740 |  |  | 5,753 |
Basic earnings per share |  | $ | 3.10 |  | $ | 2.31 |  | $ | 2.57 |
Diluted earnings per share |  | $ | 3.09 |  | $ | 2.29 |  | $ | 2.55 |

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