Income Tax Considerations (Schedule Of Reconciling Net Income Adjusted For Noncontrolling Interests To REIT Taxable Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net income adjusted for noncontrolling interests	$ 112,149	$ 315,435	$ 327,601
Net loss (income) of taxable REIT subsidiary included above	206	(32,225)	(13,496)
Net income from REIT operations	112,355	283,210	314,105
Book depreciation and amortization	147,660	132,957	158,607
Tax depreciation and amortization	(82,414)	(75,824)	(89,700)
Book/tax difference on gains/losses from capital transactions	(54,476)	(89,217)	19,807
Deferred/prepaid/above and below-market rents, net	(13,977)	(9,332)	(15,589)
Impairment loss from REIT operations	23,367	3,118	10,008
Book/tax on bad debt expense	35,075	217	(749)
Other book/tax differences, net	(5,390)	(21,575)	(12,969)
REIT taxable income	162,200	223,554	383,520
Dividends paid deduction	(162,200)	(223,554)	(383,520)
Dividends paid in excess of taxable income	0	0	0
Designated dividends	$ 114,800	$ 121,200	$ 105,700