Earnings Per Common Share (Calculation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Earnings Per Common Share [Abstract]
Net income	$ 34,531		$ 36,585
Basic weighted-average number of common shares outstanding	196,930,733	[1]	178,154,684	[1]
Plus: common stock equivalents	31,182		8,104
Diluted weighted-average number of common shares outstanding	196,961,915	[1]	178,162,788	[1]
Basic	$ 0.18	[1]	$ 0.21	[1]
Diluted	$ 0.18	[1]	$ 0.21	[1]

[1] Share data reflects the five percent common stock dividend declared on April 18, 2012, to be issued May 25, 2012 to shareholders of record on May 11, 2012.