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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2011
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Income Per Common Share |
|  | Year Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (In thousands, except per share data) |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 158,027 |  |  | $ | 205,435 |  |  | $ | 265,895 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 99,281 |  |  |  | 101,678 |  |  |  | 101,577 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 282 |  |  |  | 238 |  |  |  | 74 |
Unvested restricted stock |  |  | 813 |  |  |  | 692 |  |  |  | 707 |
Diluted common shares outstanding |  |  | 100,376 |  |  |  | 102,608 |  |  |  | 102,358 |
Basic income per common share |  | $ | 1.59 |  |  | $ | 2.02 |  |  | $ | 2.62 |
Diluted income per common share |  | $ | 1.57 |  |  | $ | 2.00 |  |  | $ | 2.60 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 260 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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