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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Calculations of Basic and Diluted Earnings Per Share | The calculations of both basic and diluted earnings per share are presented in the following table.
For the Years Ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
(in thousands, except shares and per share data) |  |  |  |  |  |  |  |  |
Calculation of Basic Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 28,863 |  |  | $ | 27,622 |  |  | $ | 26,056 |
Weighted average shares outstanding |  |  | 9,586,144 |  |  |  | 9,555,799 |  |  |  | 9,474,554 |
Basic Earnings Per Share |  | $ | 3.01 |  |  | $ | 2.89 |  |  | $ | 2.75 |
Calculation of Diluted Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 28,863 |  |  | $ | 27,622 |  |  | $ | 26,056 |
Effect of 8.25% Convertible debentures |  |  | 53 |  |  |  | 61 |  |  |  | 73 |
Adjusted numerator — Diluted |  | $ | 28,916 |  |  | $ | 27,683 |  |  | $ | 26,129 |
Reconciliation of Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted shares outstanding — Basic |  |  | 9,586,144 |  |  |  | 9,555,799 |  |  |  | 9,474,554 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  | 23,499 |  |  |  | 23,792 |  |  |  | 22,550 |
8.25% Convertible debentures |  |  | 61,864 |  |  |  | 71,467 |  |  |  | 85,270 |
Adjusted denominator — Diluted |  |  | 9,671,507 |  |  |  | 9,651,058 |  |  |  | 9,582,374 |
Diluted Earnings Per Share |  | $ | 2.99 |  |  | $ | 2.87 |  |  | $ | 2.73 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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