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				6 Months Ended				12 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Earnings Per Common Share [Abstract]
Net income	$ 23,277		$ 17,785		$ 48,780		$ 31,252		$ 74,496
Dividends and undistributed earnings allocated to participating securities	162	[1]	86	[1]	329	[1]	148	[1]
Net earnings available to common shareholders	$ 23,115		$ 17,699		$ 48,451		$ 31,104
Weighted average number of common shares outstanding - basic	111,897		114,611		111,943		114,593
Effect of potentially dilutive common shares	181	[2]	174	[2]	177	[2]	203	[2]
Weighted average number of common shares outstanding - diluted	112,078		114,785		112,120		114,796
Basic	$ 0.21		$ 0.15		$ 0.43		$ 0.27
Diluted	$ 0.21		$ 0.15		$ 0.43		$ 0.27

[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.