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Earnings per Share/Capital Stock: (Tables) | 3 Months Ended
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Mar. 31, 2016
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 used for calculating basic net income per share:
Basic: |  | For The Three Months Ended March 31,
(in thousands, except per share amounts) |  | 2016 |  | 2015
Net income |  | $ | 10,150 |  |  | $ | 12,149 |
Less: (a) Distributed earnings to common shareholders |  | 8,181 |  |  | 8,138 |
Distributed earnings to participating securities |  | 45 |  |  | 45 |
Undistributed earnings |  | 1,924 |  |  | 3,966 |
(b) Undistributed earnings allocated to common shareholders |  | 1,914 |  |  | 3,945 |
Undistributed earnings allocated to participating securities |  | 10 |  |  | 21 |
Total income available to common shareholders, basic (a)+(b) |  | $ | 10,095 |  |  | $ | 12,083 |
Weighted average Common Shares outstanding, basic |  | 36,521 |  |  | 38,205 |
Basic earnings per Common Share |  | $ | 0.28 |  |  | $ | 0.32 |
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 March 31,
(in thousands, except per share amounts) |  | 2016 |  | 2015
Common shareholders earnings, basic |  | $ | 10,095 |  |  | $ | 12,083 |
Undistributed earnings for dilutive stock-based awards |  | 10 |  |  | 21 |
Total common shareholders earnings, diluted |  | $ | 10,105 |  |  | $ | 12,104 |
Weighted average common shares outstanding, basic |  | 36,521 |  |  | 38,205 |
Stock-based compensation (1) |  | 176 |  |  | 203 |
Weighted average common shares outstanding, diluted |  | 36,697 |  |  | 38,408 |
Diluted earnings per Common Share |  | $ | 0.28 |  |  | $ | 0.32 |
(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 142,402 and 198,764 stock options at March 31, 2016 and 2015, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 215,129 and 226,319 restricted stock units at March 31, 2016 and 2015, respectively, were included in the calculation of diluted EPS for the three months ended March 31, 2016 and 2015.

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- Definition Tabular disclosure of the effect of income (loss) on basic earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 + Details
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