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Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Calculations of Basic and Diluted Income Per Common Share | The calculations of basic and diluted income per common share for the years ended December 31, 2011, 2010 and 2009 are as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (in thousands - except per share amounts) |
Income before extraordinary item |  | $ | 20,947 |  |  | $ | 14,066 |  |  | $ | 17,784 |
Extraordinary item, net of taxes |  |  | — |  |  |  | — |  |  |  | 2,477 |
Net income – Basic and Diluted |  | $ | 20,947 |  |  | $ | 14,066 |  |  | $ | 20,261 |
Weighted-average shares outstanding – Basic |  |  | 12,511 |  |  |  | 12,128 |  |  |  | 12,036 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 299 |  |  |  | 401 |  |  |  | 340 |
Weighted-average shares outstanding – Diluted |  |  | 12,810 |  |  |  | 12,529 |  |  |  | 12,376 |
Basic income per common share before extraordinary item |  | $ | 1.67 |  |  | $ | 1.16 |  |  | $ | 1.48 |
Basic income per common share of extraordinary item |  |  | — |  |  |  | — |  |  |  | 0.20 |
Basic income per common share |  | $ | 1.67 |  |  | $ | 1.16 |  |  | $ | 1.68 |
Diluted income per common share before extraordinary item |  | $ | 1.64 |  |  | $ | 1.12 |  |  | $ | 1.44 |
Diluted income per common share of extraordinary item |  |  | — |  |  |  | — |  |  |  | 0.20 |
Diluted income per common share |  | $ | 1.64 |  |  | $ | 1.12 |  |  | $ | 1.64 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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