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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Computation of Basic and Diluted Income Per Common Share | The following table sets forth the computation of basic and diluted income per common share for the periods presented.
|  | Three Months Ended September 30, |
|  | 2013 |  |  | 2012 |
(In thousands, except per share data) |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 84,180 |  |  | $ | 39,791 |
Denominator: |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 96,758 |  |  |  | 96,360 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options, unvested restricted stock and performance units |  |  | 839 |  |  |  | 989 |
Diluted common shares outstanding |  |  | 97,597 |  |  |  | 97,349 |
Basic income per common share |  | $ | 0.87 |  |  | $ | 0.41 |
Diluted income per common share |  | $ | 0.86 |  |  | $ | 0.41 |
|  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |
(In thousands, except per share data) |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 209,258 |  |  | $ | 102,789 |
Denominator: |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 96,536 |  |  |  | 96,408 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options, unvested restricted stock and performance units |  |  | 976 |  |  |  | 1,112 |
Diluted common shares outstanding |  |  | 97,512 |  |  |  | 97,520 |
Basic income per common share |  | $ | 2.17 |  |  | $ | 1.07 |
Diluted income per common share |  | $ | 2.15 |  |  | $ | 1.05 |

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration