Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Continuing Operations:
Income from continuing operations	$ 29,623	$ 31,803	$ 56,323	$ 54,930
Gain on sale of property	8,163	1,748	30,685	1,911
Net income attributable to noncontrolling interests	(1,757)	(1,561)	(3,332)	(3,118)
Dividends on preferred shares	(1,120)	(2,710)	(3,830)	(5,420)
Redemption Costs of Preferred Shares	(9,687)	0	(9,687)	0
Income from continuing operations attributable to common shareholders – basic and diluted	25,222	29,280	70,159	48,303
Discontinued Operations:
Income from discontinued operations	0	3,433	0	44,924
Net (income) loss attributable to noncontrolling interests	0	(27)	0	52
Income from discontinued operations attributable to common shareholders – basic and diluted	0	3,406	0	44,976
Net Income:
Net income attributable to common shareholders – basic and diluted	$ 25,222	$ 32,686	$ 70,159	$ 93,279
Denominator:
Weighted average shares outstanding – basic (in shares)	123,298	121,497	122,715	121,449
Effect of dilutive securities:
Share options and awards (in shares)	1,252	1,337	1,344	1,292
Weighted average shares outstanding – diluted (in shares)	124,550	122,834	124,059	122,741