Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Continuing Operations:
Income (loss) from continuing operations	$ 72,187	$ (6,531)	$ 20,935
Gain on sale of property	1,034	1,679	2,005
Net income attributable to noncontrolling interests	(5,781)	(1,118)	(5,032)
Dividends on preferred shares	(34,930)	(35,476)	(35,476)
Redemption costs of preferred shares	(2,500)	0	0
Income (loss) from continuing operations attributable to common shareholders - basic and diluted	30,010	(41,446)	(17,568)
Discontinued Operations:
Income from discontinued operations attributable to common shareholders - basic and diluted	$ 79,200	$ 21,591	$ 28,298
Denominator:
Weighted average shares outstanding - basic	120,696	120,331	119,935
Effect of dilutive securitites:
Share options and awards	1,009	0	845
Weighted average shares outstanding - diluted	121,705	120,331	120,780