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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted EPS for the years ended December 31, 2015, 2014 and 2013 are presented below.
|  | For the Year Ended December 31, |
| 2015 |  |  | 2014 |  |  | 2013 |
|  | (in thousands, except earnings per share amounts) |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net income, as reported |  | $ | 70,462 |  |  | $ | 53,666 |  |  | $ | 43,637 |
Less allocated income to participating securities |  |  | — |  |  |  | — |  |  |  | 142 |
Net income available to common shareholders – basic |  | $ | 70,462 |  |  | $ | 53,666 |  |  | $ | 43,495 |
Basic weighted-average common shares |  |  | 18,941 |  |  |  | 18,646 |  |  |  | 18,373 |
Basic earnings per share |  | $ | 3.72 |  |  | $ | 2.88 |  |  | $ | 2.37 |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders—diluted |  | $ | 70,462 |  |  | $ | 53,666 |  |  | $ | 43,495 |
Diluted weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares |  |  | 18,941 |  |  |  | 18,646 |  |  |  | 18,373 |
Stock options and performance shares |  |  | 178 |  |  |  | 282 |  |  |  | 376 |
Diluted weighted average common shares |  |  | 19,119 |  |  |  | 18,928 |  |  |  | 18,749 |
Diluted earnings per common share |  | $ | 3.69 |  |  | $ | 2.84 |  |  | $ | 2.32 |
Calculation of Percentage of Net Income Allocable to Common Shareholders | The table below sets forth the reconciliation of the weighted average shares used for the basic and diluted EPS calculation. Under the two-class method, unvested stock options, and out-of-money vested stock options are not considered to be participating securities.
|  | Years Ended |
| 2015 |  |  | 2014 |  |  | 2013 |
Basic weighted average common shares |  |  | 18,941,077 |  |  |  | 18,646,128 |  |  |  | 18,373,033 |
Add: Other common shares eligible for common dividends: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average restricted shares and stock options (including tax benefit component) |  |  | 178,109 |  |  |  | 282,376 |  |  |  | 375,776 |
Diluted weighted average common shares |  |  | 19,119,186 |  |  |  | 18,928,504 |  |  |  | 18,748,809 |

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