Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Continuing Operations:
Income from continuing operations	$ 23,618	$ 21,812	$ 88,932	$ 30,400
Gain on sale of property	163	335	570	859
Net income attributable to noncontrolling interests	(1,948)	(1,505)	(4,000)	(3,726)
Dividends on preferred shares	(2,710)	(8,869)	(15,463)	(26,607)
Redemption costs of preferred shares	0	0	(17,944)	0
Income from continuing operations attributable to common shareholders – basic and diluted	19,123	11,773	52,095	926
Discontinued Operations:
Income from discontinued operations	38,608	19,900	121,882	66,187
Net loss (income) attributable to noncontrolling interests	101	(269)	(37,056)	(831)
Income from discontinued operations attributable to common shareholders - basic and diluted	$ 38,709	$ 19,631	$ 84,826	$ 65,356
Denominator:
Weighted average shares outstanding - basic	121,359	120,766	121,235	120,637
Effect of dilutive securities:
Share options and awards	1,172	1,078	1,206	1,016
Weighted average shares outstanding - diluted	122,531	121,844	122,441	121,653