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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 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 for 2015, 2014 and 2013 are as follows:
|  | Year ended December 31, 2015
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 58,024,000 |  |  |  |  |
| Basic earnings per common share | $ | 58,024,000 |  |  | 71,826,000 |  |  | $ | 0.81 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and unvested restricted stock |  |  | 686,000 |  |  | (0.01 | )
| Diluted earnings per common share | $ | 58,024,000 |  |  | 72,512,000 |  |  | $ | 0.80 |
|  | Year ended December 31, 2014
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 21,850,000 |  |  |  |  |
| Basic earnings per common share | $ | 21,850,000 |  |  | 70,616,000 |  |  | $ | 0.31 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and unvested restricted stock |  |  | 725,000 |  |  | — |
| Diluted earnings per common share | $ | 21,850,000 |  |  | 71,341,000 |  |  | $ | 0.31 |
|  | Year ended December 31, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 47,129,000 |  |  |  |  |
| Basic earnings per common share | $ | 47,129,000 |  |  | 69,206,000 |  |  | $ | 0.68 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and unvested restricted stock |  |  | 839,000 |  |  | (0.01 | )
| Diluted earnings per common share | $ | 47,129,000 |  |  | 70,045,000 |  |  | $ | 0.67 |

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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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