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Earnings Per Share and Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2014
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 reflecting the two-for-one stock split effective September 3, 2013:
Basic |  | For The Years Ended December 31,
(in thousands, except per share amounts) |  | 2014 |  | 2013 |  | 2012
Net income |  | $ | 61,058 |  |  | $ | 62,686 |  |  | $ | 54,148 |
Less: (a) Distributed earnings to common shareholders |  | 32,125 |  |  | 29,366 |  |  | 24,129 |
Distributed earnings to participating securities |  | 177 |  |  | 171 |  |  | 171 |
Undistributed earnings |  | 28,756 |  |  | 33,149 |  |  | 29,848 |
(b) Undistributed earnings allocated to common shareholders |  | 28,599 |  |  | 32,958 |  |  | 29,638 |
Undistributed earnings allocated to participating securities |  | 157 |  |  | 191 |  |  | 210 |
Total income available to common shareholders, basic (a)+(b) |  | $ | 60,724 |  |  | $ | 62,324 |  |  | $ | 53,767 |
Weighted average Common Shares outstanding, basic |  | 38,658 |  |  | 38,639 |  |  | 37,998 |
Basic earnings per Common Share: |  | $ | 1.57 |  |  | $ | 1.61 |  |  | $ | 1.42 |
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 reflecting the two-for-one stock split effective September 3, 2013:
Diluted |  | For The Years Ended December 31,
(in thousands, except per share amounts) |  | 2014 |  | 2013 |  | 2012
Common shareholders earnings, basic |  | $ | 60,724 |  |  | $ | 62,324 |  |  | $ | 53,767 |
Undistributed earnings for dilutive stock options and restricted stock units |  | 157 |  |  | 191 |  |  | 210 |
Total common shareholders earnings, diluted |  | $ | 60,881 |  |  | $ | 62,515 |  |  | $ | 53,977 |
Weighted average Common Shares outstanding, basic |  | 38,658 |  |  | 38,639 |  |  | 37,998 |
Stock-based compensation (1) |  | 222 |  |  | 230 |  |  | 264 |
Weighted average Common Shares outstanding, diluted |  | 38,880 |  |  | 38,869 |  |  | 38,262 |
Diluted earnings per Common Share |  | $ | 1.57 |  |  | $ | 1.61 |  |  | $ | 1.41 |
(1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 222,580 stock options and 221,302 restricted stock units, including performance awards, at December 31, 2014 were deemed to be outstanding in accordance with accounting guidance on earnings per share.

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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 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: 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 3: 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 Reference 4: 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 + Details
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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: 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 2: 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 3: 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 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1311-109256 + Details
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