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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30, |
|  | 2013 |  |  | 2012 |
(In thousands, except per share data) |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 64,465 |  |  | $ | 45,154 |
Denominator: |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 96,432 |  |  |  | 96,266 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options, unvested restricted stock and performance units |  |  | 1,062 |  |  |  | 1,145 |
Diluted common shares outstanding |  |  | 97,494 |  |  |  | 97,411 |
Basic income per common share |  | $ | 0.67 |  |  | $ | 0.47 |
Diluted income per common share |  | $ | 0.66 |  |  | $ | 0.46 |
|  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |
(In thousands, except per share data) |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 125,078 |  |  | $ | 62,998 |
Denominator: |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 96,424 |  |  |  | 96,432 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options, unvested restricted stock and performance units |  |  | 1,037 |  |  |  | 1,164 |
Diluted common shares outstanding |  |  | 97,461 |  |  |  | 97,596 |
Basic income per common share |  | $ | 1.30 |  |  | $ | 0.65 |
Diluted income per common share |  | $ | 1.28 |  |  | $ | 0.65 |

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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