Earnings Per Share (Schedule Of Computation Of Earnings Per Common Share Using The Two-Class Method) (Details) (USD $) In Thousands, except Share data	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Earnings Per Share [Abstract]
Net income to common shareholders	$ 30,378	$ 14,853	$ 57,793	$ 35,187
Net income allocated to participating securities - basic and diluted	101	58	252	174
Net income allocated to common shareholders - basic and diluted	$ 30,277	$ 14,795	$ 57,541	$ 35,013
Weighted-average common shares - basic	84,699,000	36,880,000	59,149,000	36,864,000
Dilutive potential common shares	286,000	115,000	293,000	188,000
Weighted average common shares - diluted	84,985,000	36,995,000	59,442,000	37,052,000
Basic	$ 0.36	$ 0.40	$ 0.97	$ 0.95
Diluted	$ 0.36	$ 0.40	$ 0.97	$ 0.94
Weighted-average anti-dilutive potential common shares	489,727		236,173		0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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