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		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share
Net income to common shareholders	$ 12,088	$ 6,500	$ 27,416	$ 20,334
Net income allocated to participating securities - basic and diluted	77	58	151	115
Net income allocated to common shareholders - basic and diluted	$ 12,011	$ 6,442	$ 27,265	$ 20,219
Weighted-average common shares - basic	54,890,000	36,876,000	46,160,000	36,855,000
Dilutive potential common shares	145,000	202,000	150,000	220,000
Weighted average common shares - diluted	55,035,000	37,078,000	46,310,000	37,075,000
Basic	$ 0.22	$ 0.17	$ 0.59	$ 0.55
Diluted	$ 0.22	$ 0.17	$ 0.59	$ 0.55
Options were anti-dilutive share-based incentives	775,261		775,261
Anti-dilutive share-based incentives outstanding	$ 0	$ 0	$ 0	$ 0