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Earnings Per Share and Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
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 Years Ended December 31,
(in thousands, except per share amounts) |  | 2018 |  | 2017 |  | 2016
Net income |  | $ | 63,871 |  |  | $ | 69,367 |  |  | $ | 59,743 |
Less: (a) Distributed earnings to common shareholders |  | 38,937 |  |  | 36,417 |  |  | 33,408 |
Distributed earnings to participating securities |  | 204 |  |  | 197 |  |  | 187 |
Undistributed earnings |  | 24,730 |  |  | 32,753 |  |  | 26,148 |
(b) Undistributed earnings allocated to common shareholders |  | 24,601 |  |  | 32,577 |  |  | 26,003 |
Undistributed earnings allocated to participating securities |  | 129 |  |  | 176 |  |  | 145 |
Total income available to common shareholders, basic (a)+(b) |  | $ | 63,538 |  |  | $ | 68,994 |  |  | $ | 59,411 |
Weighted average Common Shares outstanding, basic |  | 36,733 |  |  | 36,638 |  |  | 36,552 |
Basic earnings per Common Share |  | $ | 1.73 |  |  | $ | 1.88 |  |  | $ | 1.63 |
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 Years Ended December 31,
(in thousands, except per share amounts) |  | 2018 |  | 2017 |  | 2016
Common shareholders earnings, basic |  | $ | 63,538 |  |  | $ | 68,994 |  |  | $ | 59,411 |
Undistributed earnings for dilutive stock options and restricted stock units |  | 129 |  |  | 176 |  |  | 145 |
Total common shareholders earnings, diluted |  | $ | 63,667 |  |  | $ | 69,170 |  |  | $ | 59,556 |
Weighted average Common Shares outstanding, basic |  | 36,733 |  |  | 36,638 |  |  | 36,552 |
Stock-based compensation (1) |  | 203 |  |  | 206 |  |  | 198 |
Weighted average Common Shares outstanding, diluted |  | 36,936 |  |  | 36,844 |  |  | 36,750 |
Diluted earnings per Common Share |  | $ | 1.72 |  |  | $ | 1.88 |  |  | $ | 1.62 |
(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 35,560 stock options and 197,896 restricted stock units, including performance awards, at December 31, 2018 were deemed to be outstanding in accordance with accounting guidance on earnings per share.

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