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Debt (Summary Of Debt Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jul. 12, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Mortgages payable	$ 471,117		$ 481,084
Notes payable	279,151		341,961
Net unamortized debt issuance costs	(1,096)		(1,639)
Senior notes and debentures	1,976,594		1,732,551
Capital lease obligations	71,590		71,620
Total debt and capital lease obligations	2,798,452		2,627,216
Mortgages Payable
Debt Instrument [Line Items]
Principal balance	466,305		471,994
Net unamortized (discount)/premium and debt issuance costs	4,812		9,090
Notes Payable
Debt Instrument [Line Items]
Notes payable	280,247		343,600
Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	1,994,200		1,744,200
Net unamortized (discount)/premium and debt issuance costs	(17,606)		(11,649)
Plaza El Segundo \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 175,000		175,000
Interest rate	6.33%
The Grove at Shrewsbury (East) \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 42,536		43,557
Interest rate	5.82%
The Grove at Shrewsbury (West) \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 10,792		11,024
Interest rate	6.38%
Rollingwood Apartments \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 21,283		21,716
Interest rate	5.54%
The Shops at Sunset Place \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 68,634		70,542
Interest rate	5.624%
29th Place \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 4,553		4,753
Interest rate	5.91%
THE AVENUE at White Marsh \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 52,705		52,705
Interest rate	3.35%
Montrose Crossing \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 72,726		74,329
Interest rate	4.20%
Brook 35 \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 11,500		11,500
Interest rate	4.65%
Chelsea \| Mortgages Payable
Debt Instrument [Line Items]
Principal balance	$ 6,576		6,868
Interest rate	5.36%
Escondido Promenade \| Notes Payable
Debt Instrument [Line Items]
Municipal bond	$ 0		9,400
Revolving credit facility \| Notes Payable
Debt Instrument [Line Items]
Revolving credit facility	0		53,500
Term Loan \| Notes Payable
Debt Instrument [Line Items]
Other Notes Payable	$ 275,000		275,000
Various \| Notes Payable
Debt Instrument [Line Items]
Interest rate	11.31%
Other Notes Payable	$ 5,247		5,700
5.90% notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 150,000		150,000
Interest rate	5.90%
2.55% notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 250,000		250,000
Interest rate	2.55%
3.00% notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 250,000		250,000
Interest rate	3.00%
2.75% notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 275,000		275,000
Interest rate	2.75%
3.95% notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 300,000		300,000
Interest rate	3.95%
7.48% debentures \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 29,200		29,200
Interest rate	7.48%
6.82% medium term notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 40,000		40,000
Interest rate	6.82%
4.50% notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 450,000		450,000
Interest rate	4.50%
3.625% Senior notes \| Senior Notes and Debentures
Debt Instrument [Line Items]
Principal balance	$ 250,000	$ 250,000	$ 0
Interest rate	3.625%	3.625%