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Earnings per Share/Capital Stock: (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating basic net income per share | The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating basic net income per share:
Basic: |  | For The Three Months Ended June 30, |  | For The Six Months Ended June 30,
(in thousands, except per share amounts) |  | 2013 |  | 2012 |  | 2013 |  | 2012
Net income |  | $ | 16,602 |  |  | 15,078 |  |  | 30,067 |  |  | 25,193 |
Less: (a) |  | Distributed earnings to common shareholders |  | 6,854 |  |  | 5,287 |  |  | 13,693 |  |  | 10,560 |
|  | Distributed earnings to participating securities |  | 95 |  |  | 38 |  |  | 181 |  |  | 68 |
Undistributed earnings |  | 9,653 |  |  | 9,753 |  |  | 16,193 |  |  | 14,565 |
(b) |  | Undistributed earnings allocated to common shareholders |  | 9,522 |  |  | 9,683 |  |  | 15,982 |  |  | 14,472 |
|  | Undistributed earnings allocated to participating securities |  | 131 |  |  | 70 |  |  | 211 |  |  | 93 |
Total income available to common shareholders, basic (a)+(b) |  | $ | 16,376 |  |  | $ | 14,970 |  |  | $ | 29,675 |  |  | $ | 25,032 |
Weighted average Common Shares outstanding, basic |  | 19,306 |  |  | 18,882 |  |  | 19,285 |  |  | 18,857 |
Basic earnings per Common Share |  | $ | 0.85 |  |  | $ | 0.79 |  |  | $ | 1.54 |  |  | $ | 1.33 |
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating diluted net income per share | The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating diluted net income per share:
Diluted: |  | For The Three Months Ended June 30, |  | For The Six Months Ended June 30,
(in thousands, except per share amounts) |  | 2013 |  | 2012 |  | 2013 |  | 2012
Common shareholders earnings, basic |  | $ | 16,376 |  |  | $ | 14,970 |  |  | $ | 29,675 |  |  | $ | 25,032 |
Undistributed earnings for dilutive stock options |  | — |  |  | — |  |  | — |  |  | 93 |
Total common shareholders earnings, diluted |  | $ | 16,376 |  |  | $ | 14,970 |  |  | $ | 29,675 |  |  | $ | 25,125 |
Weighted average common shares outstanding, basic |  | 19,306 |  |  | 18,882 |  |  | 19,285 |  |  | 18,857 |
Stock-based compensation (1) |  | 40 |  |  | 63 |  |  | 39 |  |  | 131 |
Weighted average common shares outstanding, diluted |  | 19,346 |  |  | 18,945 |  |  | 19,324 |  |  | 18,988 |
Diluted earnings per Common Share |  | $ | 0.85 |  |  | $ | 0.79 |  |  | $ | 1.54 |  |  | $ | 1.32 |
(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 140,834 and 410,760 stock options at June 30, 2013 and 2012, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. All of the 130,453 and 147,109 restricted stock units at June 30, 2013 and 2012, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2013 and 2012.
Schedule of Pro forma per share data | Pro forma per share data for the three and six months ended June 30, 2013 on a post-split basis are presented below:
Earnings per share | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
As reported: |  |  |  |  |  |  |
Basic weighted average shares outstanding (in 000's) | 19,306 |  |  | 18,882 |  |  | 19,285 |  |  | 18,857 |
Basic earnings per share | $ | 0.85 |  |  | $ | 0.79 |  |  | $ | 1.54 |  |  | $ | 1.33 |
Diluted weighted average shares outstanding (in 000's) | 19,346 |  |  | 18,945 |  |  | 19,324 |  |  | 18,988 |
Diluted earnings per share | $ | 0.85 |  |  | $ | 0.79 |  |  | $ | 1.54 |  |  | $ | 1.32 |
Pro forma two-for-one split adjusted: |  |  |  |  |  |  |
Basic weighted average shares outstanding (in 000's) | 38,612 |  |  | 37,764 |  |  | 38,570 |  |  | 37,714 |
Basic earnings per share | $ | 0.425 |  |  | $ | 0.395 |  |  | $ | 0.770 |  |  | $ | 0.665 |
Diluted weighted average shares outstanding (in 000's) | 38,692 |  |  | 37,890 |  |  | 38,648 |  |  | 37,976 |
Diluted earnings per share | $ | 0.425 |  |  | $ | 0.395 |  |  | $ | 0.770 |  |  | $ | 0.660 |

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