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Earnings Per Share (Computation Of Basic And Diluted Income Per Common Share) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share
Net income	$ 41,777	$ 93,320	$ 118,562	$ 150,544
Basic common shares outstanding	99,020	101,776	99,945	101,912
Stock options	214	222	294	243
Unvested restricted stock	796	689	791	667
Dilutive common shares outstanding	100,030	102,687	101,030	102,822
Basic income per common share	$ 0.42	$ 0.92	$ 1.19	$ 1.48
Diluted income per common share	$ 0.42	$ 0.91	$ 1.17	$ 1.46

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of stock option awards using the treasury stock method.

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The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

+ References

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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