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Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 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 September 30, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 13,790,000 |  |  |  |  |
| Basic earnings per common share | $ | 13,790,000 |  |  | 69,706,000 |  |  | $ | 0.20 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 825,000 |  |  | — |
| Diluted earnings per common share | $ | 13,790,000 |  |  | 70,531,000 |  |  | $ | 0.20 |
|  | Three Months Ended September 30, 2012
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 11,517,000 |  |  |  |  |
| Basic earnings per common share | $ | 11,517,000 |  |  | 67,651,000 |  |  | $ | 0.17 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 984,000 |  |  | — |
| Diluted earnings per common share | $ | 11,517,000 |  |  | 68,635,000 |  |  | $ | 0.17 |
|  | Nine Months Ended September 30, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 41,677,000 |  |  |  |  |
| Basic earnings per common share | $ | 41,677,000 |  |  | 68,926,000 |  |  | $ | 0.60 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 832,000 |  |  | — |
| Diluted earnings per common share | $ | 41,677,000 |  |  | 69,758,000 |  |  | $ | 0.60 |
|  | Nine Months Ended September 30, 2012
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 31,416,000 |  |  |  |  |
| Basic earnings per common share | $ | 31,416,000 |  |  | 67,344,000 |  |  | $ | 0.47 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 972,000 |  |  | (0.01 | )
| Diluted earnings per common share | $ | 31,416,000 |  |  | 68,316,000 |  |  | $ | 0.46 |

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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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