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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net income adjusted for noncontrolling interests	$ 315,435	$ 327,601	$ 335,274
Net (income) loss of taxable REIT subsidiary included above	(32,225)	(13,496)	4,220
Net income from REIT operations	283,210	314,105	339,494
Book depreciation and amortization	132,957	158,607	162,964
Tax depreciation and amortization	(75,824)	(89,700)	(95,512)
Book/tax difference on gains/losses from capital transactions	(89,217)	19,807	6,261
Deferred/prepaid/above and below-market rents, net	(9,332)	(15,589)	(11,146)
Impairment loss from REIT operations	3,118	10,008	5,071
Other book/tax differences, net	(21,358)	(13,718)	(244)
REIT taxable income	223,554	383,520	406,888
Dividends paid deduction	(223,554)	(383,520)	(406,888)
Dividends paid in excess of taxable income	0	0	0
Designated dividends	$ 121,200	$ 105,700	$ 112,800