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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net income adjusted for noncontrolling interests	$ 327,601	$ 335,274	$ 238,933
Net (income) loss of taxable REIT subsidiary included above	(13,496)	4,220	(14,497)
Net income from REIT operations	314,105	339,494	224,436
Book depreciation and amortization	158,607	162,964	162,534
Tax depreciation and amortization	(89,700)	(95,512)	(104,734)
Book/tax difference on gains/losses from capital transactions	19,807	6,261	(64,917)
Deferred/prepaid/above and below-market rents, net	(15,589)	(11,146)	(13,114)
Impairment loss from REIT operations	10,008	5,071	369
Other book/tax differences, net	(13,718)	(244)	(2,694)
REIT taxable income	383,520	406,888	201,880
Dividends paid deduction	(383,520)	(406,888)	(201,880)
Dividends paid in excess of taxable income	0	0	0
Designated dividends	$ 105,700	$ 112,800	$ 16,800