Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Continuing Operations:
Income from continuing operations	$ 39,924	$ 20,633
Gain on Sale of Property	109,045	15,763
Net income attributable to noncontrolling interests	(2,145)	(5,570)
Net income attributable to common shareholders - basic	146,824	30,826
Income attributable to operating partnership units	528	0
Net income attributable to common shareholders - diluted	$ 147,352	$ 30,826
Denominator:
Weighted average shares outstanding – basic (in shares)	127,926	127,610
Effect of dilutive securities:
Share options and awards (in shares)	781	938
Operating partnership units (in shares)	1,432	0
Weighted average shares outstanding – diluted (in shares)	130,139	128,548