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Earnings Per Share (Computation Of Basic And Diluted Income Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net income	$ 17,844	$ 37,417
Basic common shares outstanding	96,598	100,741
Stock options	213	332
Unvested restricted stock	918	836
Diluted common shares outstanding	97,729	101,909
Basic income per common share	$ 0.18	$ 0.37
Diluted income per common share	$ 0.18	$ 0.37

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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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