Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Continuing Operations:
Net income	$ 108,509	$ 53,274	$ 245,283	$ 282,114
Net income attributable to noncontrolling interests	(1,767)	(10,293)	(5,066)	(14,020)
Net income attributable to common shareholders - basic	106,742	42,981	240,217	268,094
Income attributable to operating partnership units	528	0	1,584	1,584
Net income attributable to common shareholders - diluted	$ 107,270	$ 42,981	$ 241,801	$ 269,678
Denominator:
Weighted average shares outstanding – basic (in shares)	127,870	127,525	127,828	127,651
Effect of dilutive securities:
Share options and awards (in shares)	835	792	839	809
Operating partnership units (in shares)	1,432	0	1,432	1,432
Weighted average shares outstanding – diluted (in shares)	130,137	128,317	130,099	129,892