Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Continuing Operations:
Income from continuing operations	$ 44,830	$ 14,931
Gain on sale of property	142	440
Net income attributable to noncontrolling interests	(1,467)	(1,441)
Dividends on preferred shares	(7,440)	(8,869)
Redemption costs of preferred shares	(2,242)	0
Income from continuing operations attributable to common shareholders – basic and diluted	33,823	5,061
Discontinued Operations:
(Loss) income from discontinued operations attributable to common shareholders - basic and diluted	$ (155)	$ 7,267
Denominator:
Weighted average shares outstanding - basic	121,058	120,481
Effect of dilutive securities:
Share options and awards	1,165	960
Weighted average shares outstanding - diluted	122,223	121,441