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Earnings per Share | 6 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings per Share Net income is divided by the weighted average number of common shares outstanding during the period to calculate basic earnings per share. Diluted earnings per share is calculated to give effect to stock options and restricted share awards. The following table summarizes the dilutive effect of restricted shares and options to purchase common stock for the three and six months ended June 30, 2016 and 2015.
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Weighted average common shares—basic |  | 45,429,851 |  |  | 45,150,827 |  |  | 45,354,421 |  |  | 45,074,394 |
Dilutive effect of restricted share awards |  | 215,881 |  |  | 160,936 |  |  | 251,035 |  |  | 220,102 |
Dilutive effect of stock options |  | 80,616 |  |  | 107,144 |  |  | 85,126 |  |  | 115,379 |
Weighted average common shares—diluted |  | 45,726,348 |  |  | 45,418,907 |  |  | 45,690,582 |  |  | 45,409,875 |

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