Income Tax Considerations (Schedule Of Reconciling Net Income Adjusted For Noncontrolling Interests To REIT Taxable Income) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Income Tax Note [Line Items]
Net income adjusted for noncontrolling interests	$ 220,262,000		$ 146,640,000		$ 15,621,000
Net (income) loss of taxable REIT subsidiary included above	(4,684,000)		11,457,000		32,043,000
Net income from REIT operations	215,578,000		158,097,000		47,664,000
Book depreciation and amortization including discontinued operations	157,665,000		148,413,000		157,290,000
Tax depreciation and amortization	(90,047,000)		(92,797,000)		(100,633,000)
Book/tax difference on gains/losses from capital transactions	(33,969,000)		(55,242,000)		(13,398,000)
Deferred/prepaid/above and below-market rents, net	(6,429,000)		(4,264,000)		(13,088,000)
Impairment loss from REIT operations including discontinued operations	474,000		11,396,000		58,353,000
Other book/tax differences, net	(9,695,000)		1,430,000		(3,652,000)
REIT taxable income	233,577,000		167,033,000		132,536,000
Dividends paid deduction	(233,577,000)	[1]	(173,202,000)	[1]	(165,721,000)	[1]
Dividends paid in excess of taxable income	0		(6,169,000)		(33,185,000)
Designated dividends	$ 67,700,000

[1] For 2013, the dividends paid deduction includes designated dividends of $67.7 million from 2014.