Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
INCOME FROM CONTINUING OPERATIONS	$ 61,055	$ 58,107	$ 182,231	$ 175,136
Less: Preferred share dividends	(2,010)	(177)	(6,031)	(448)
Less: Income from continuing operations attributable to noncontrolling interests	(1,622)	(2,105)	(5,244)	(5,537)
Less: Earnings allocated to unvested shares	(211)	(317)	(719)	(785)
Income from continuing operations available for common shareholders	57,212	55,508	170,237	168,366
Gain on sale of real estate, net	3,125	50,775	10,413	69,659
Net income available for common shareholders, basic and diluted	$ 60,337	$ 106,283	$ 180,650	$ 238,025
Weighted average common shares outstanding—basic	73,400	72,091	73,100	71,983
Stock options	8	115	36	127
Weighted average common shares outstanding—diluted	73,408	72,206	73,136	72,110
Earnings per common share, basic	$ 0.82	$ 1.47	$ 2.47	$ 3.31
Earnings per common share, diluted	$ 0.82	$ 1.47	$ 2.47	$ 3.30
Income from continuing operations attributable to the Trust	$ 59,433	$ 56,002	$ 176,987	$ 169,599