Segment Information (Reconciliation Of Segment Net Operating Income To Income From Continuing Operations) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Information [Abstract]
Total Segment Net Operating Income	$ 95,930	$ 94,664	$ 281,481	$ 279,351
Depreciation and Amortization	(38,872)	(35,921)	(114,499)	(107,466)
Impairment Loss	(35,344)	(4,941)	(55,006)	(21,002)
General and Administrative	(5,777)	(6,443)	(18,939)	(19,096)
Interest Expense, net	(35,814)	(36,579)	(110,005)	(111,124)
Interest and Other (Expense) Income, net	(494)	3,070	2,984	6,905
Equity in (Loss) Earnings of Real Estate Joint Ventures and Partnerships, net	(3,034)	3,455	3,942	9,321
Loss on Redemption of Convertible Senior Unsecured Notes				(135)
Gain on Land and Merchant Development Sales	383		1,346
(Provision) Benefit for Income Taxes	(471)	23	(229)	(93)
(Loss) Income from Continuing Operations	$ (23,493)	$ 17,328	$ (8,925)	$ 36,661

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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The difference between the carrying value and the sale price of merchant build development real estate or properties and land that were intended to be sold. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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