Earnings Per Share (Computations Of Basic And Diluted EPS) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net income applicable to common shareholders	$ 65,727	$ 25,857
Less: Undistributed net income allocable to participating securities	(677)	(338)
Net income (loss) applicable to common shareholders	65,050	25,519
Weighted average number of shares outstanding - basic	104,530	104,471
Stock options, Shares	98	71
Undistributed earnings reallocated to participating securities, value	3	1
Convertible preferred stock	10	10
Convertible preferred stock, Shares	361	361
Net income per common share - Diluted	$ 65,063	$ 25,530
Weighted average number of shares outstanding, diluted, total	104,989	104,903