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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Net Earnings Per Share | The computations of basic net earnings per share and diluted net earnings per share are as follows:
|  | Three Months Ended June 30, 2015
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 16,288,000 |  |  |  |  |
| Basic earnings per common share | $ | 16,288,000 |  |  | 71,657,000 |  |  | $ | 0.23 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 629,000 |  |  | — |
| Diluted earnings per common share | $ | 16,288,000 |  |  | 72,286,000 |  |  | $ | 0.23 |
|  | Three Months Ended June 30, 2014
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 13,921,000 |  |  |  |  |
| Basic earnings per common share | $ | 13,921,000 |  |  | 70,440,000 |  |  | $ | 0.20 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 766,000 |  |  | — |
| Diluted earnings per common share | $ | 13,921,000 |  |  | 71,206,000 |  |  | $ | 0.20 |
|  | Six Months Ended June 30, 2015
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 31,804,000 |  |  |  |  |
| Basic earnings per common share | $ | 31,804,000 |  |  | 71,563,000 |  |  | $ | 0.44 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 660,000 |  |  | — |
| Diluted earnings per common share | $ | 31,804,000 |  |  | 72,223,000 |  |  | $ | 0.44 |
|  | Six Months Ended June 30, 2014
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 28,560,000 |  |  |  |  |
| Basic earnings per common share | $ | 28,560,000 |  |  | 70,381,000 |  |  | $ | 0.41 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 759,000 |  |  | (0.01 | )
| Diluted earnings per common share | $ | 28,560,000 |  |  | 71,140,000 |  |  | $ | 0.40 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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