Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Continuing Operations:
Net income	$ 51,254	$ 148,969
Net income attributable to noncontrolling interests	(1,588)	(2,145)
Net income attributable to common shareholders - basic	49,666	146,824
Income attributable to operating partnership units	0	528
Net income attributable to common shareholders - diluted	$ 49,666	$ 147,352
Denominator:
Weighted average shares outstanding – basic (in shares)	127,756	127,926
Effect of dilutive securities:
Share options and awards (in shares)	834	781
Operating partnership units (in shares)	0	1,432
Weighted average shares outstanding – diluted (in shares)	128,590	130,139