Income Per Share (Summary Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Per Share [Abstract]
Net income available to common stockholders	$ 45,615	$ 31,908	$ 126,847	$ 94,878
Weighted average shares outstanding-basic	122,026,421	100,588,235	112,995,512	96,137,611
Stock options	76,774	197,632	74,462	192,885
Class C Units (2007 Grant)		49,163		38,654
Unvested incentive units	250,316	162,832	205,247	145,032
Series E preferred stock/units		914,480		308,176
Excess exchange value of the 2026 Debentures				494,292
Weighted average shares/units outstanding-diluted	122,353,511	101,912,342	113,275,221	97,316,650
Basic	$ 0.37	$ 0.32	$ 1.12	$ 0.99
Diluted	$ 0.37	$ 0.31	$ 1.12	$ 0.97

Incremental Common Shares Attributable To Profit Interest Units

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Incremental common shares attributable to series E preferred stock

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

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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