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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract] |
Activity in the allowance for doubtful accounts | The activity in the allowance for doubtful accounts during the years ended December 31, 2012, 2011 and 2010 was as follows:
|  |  |  |  |  |  |  | Write Off of |  |  |  |
|  | Balance |  |  | Charged to |  |  | Uncollectible |  |  | Balance at |
|  | at Beginning |  |  | Costs and |  |  | Accounts, Net of |  |  | End of |
Year Ended |  | of Period |  |  | Expenses |  |  | Recoveries |  |  | Period |
|  | (In thousands) |
December 31, 2012 |  | $794 |  |  | $134 |  |  | $(351) |  |  | $577 |
December 31, 2011 |  | $797 |  |  | $526 |  |  | $(529) |  |  | $794 |
December 31, 2010 |  | $733 |  |  | $560 |  |  | $(496) |  |  | $797
Property and equipment | Property and equipment consisted of the following:
|  | Estimated |  |  | December 31, |
|  | Useful Life |  |  | 2012 |  |  | 2011 |
|  |  |  |  | (In thousands) |
Land and land improvements |  |  | — |  |  | $ | 11,321 |  |  | $ | 11,178 |
Buildings |  |  | 31.5 years |  |  |  | 32,367 |  |  |  | 31,741 |
Towers and antennae |  |  | 7-15 years |  |  |  | 25,687 |  |  |  | 25,582 |
Equipment |  |  | 3-15 years |  |  |  | 74,874 |  |  |  | 74,403 |
Furniture, fixtures and leasehold improvements |  |  | 7-20 years |  |  |  | 7,768 |  |  |  | 7,623 |
Vehicles |  |  | 5 years |  |  |  | 3,762 |  |  |  | 3,720 |
|  |  |  |  |  |  | 155,779 |  |  |  | 154,247 |
Accumulated depreciation |  |  |  |  |  |  | (97,317 | ) |  |  | (93,625 | )
Net property and equipment |  |  |  |  |  | $ | 58,462 |  |  | $ | 60,622 |
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, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (In thousands, except per share data) |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 17,925 |  |  | $ | 12,631 |  |  | $ | 15,136 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share-weighted average shares |  |  | 5,659 |  |  |  | 5,651 |  |  |  | 5,640 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 13 |  |  |  | 5 |  |  |  | 1 |
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions |  |  | 5,672 |  |  |  | 5,656 |  |  |  | 5,641 |
Basic earnings per share |  | $ | 3.17 |  |  | $ | 2.24 |  |  | $ | 2.68 |
Diluted earnings per share |  | $ | 3.16 |  |  | $ | 2.23 |  |  | $ | 2.68

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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