Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
INCOME FROM CONTINUING OPERATIONS	$ 59,615	$ 57,892
Less: Preferred share dividends	(2,010)	(135)
Less: Income from continuing operations attributable to noncontrolling interests	(1,684)	(1,772)
Less: Earnings allocated to unvested shares	(253)	(235)
Income from continuing operations available for common shareholders	55,668	55,750
Gain on sale of real estate, net	3,316	70
Net income available for common shareholders, basic and diluted	$ 58,984	$ 55,820
Weighted average common shares outstanding—basic	72,905	71,862
Stock options	63	143
Weighted average common shares outstanding—diluted	72,968	72,005
Earnings per common share, basic	$ 0.81	$ 0.78
Earnings per common share, diluted	$ 0.81	$ 0.78
Income from continuing operations attributable to the Trust	$ 57,931	$ 56,120