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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2013
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, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 12,933,000 |  |  |  |  |
| Basic earnings per common share | $ | 12,933,000 |  |  | 68,599,000 |  |  | $ | 0.19 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 771,000 |  |  | — |
| Diluted earnings per common share | $ | 12,933,000 |  |  | 69,370,000 |  |  | $ | 0.19 |
|  | Three Months Ended June 30, 2012
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 11,320,000 |  |  |  |  |
| Basic earnings per common share | $ | 11,320,000 |  |  | 67,296,000 |  |  | $ | 0.17 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 932,000 |  |  | — |
| Diluted earnings per common share | $ | 11,320,000 |  |  | 68,228,000 |  |  | $ | 0.17 |
|  | Six Months Ended June 30, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 27,887,000 |  |  |  |  |
| Basic earnings per common share | $ | 27,887,000 |  |  | 68,531,000 |  |  | $ | 0.41 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 835,000 |  |  | (0.01 | )
| Diluted earnings per common share | $ | 27,887,000 |  |  | 69,366,000 |  |  | $ | 0.40 |
|  | Six Months Ended June 30, 2012
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 19,899,000 |  |  |  |  |
| Basic earnings per common share | $ | 19,899,000 |  |  | 67,189,000 |  |  | $ | 0.30 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 966,000 |  |  | (0.01 | )
| Diluted earnings per common share | $ | 19,899,000 |  |  | 68,155,000 |  |  | $ | 0.29 |

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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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