Earnings Per Common Share (Computation Of Basic And Diluted Earnings (Loss) Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Dec. 31, 2011
Earnings Per Common Share [Abstract]
Net income	$ 25,503		$ 13,467		$ 74,496
Dividends and undistributed earnings allocated to participating securities	167	[1]	62	[1]
Net earnings available to common shareholders	$ 25,336		$ 13,405
Weighted average number of common shares outstanding - basic	111,989		114,575
Effect of potentially dilutive common shares	171	[2]	171	[2]
Weighted average number of common shares outstanding - diluted	112,160		114,746
Basic	$ 0.23		$ 0.12
Diluted	$ 0.23		$ 0.12

[1] Represents dividends paid and undistributed earnings allocated to nonvested restricted stock awards.

[2] Represents the effect of the assumed exercise of warrants, assumed exercise of stock options, vesting of non-participating restricted shares, and vesting of restricted stock units, based on the treasury stock method.