Segment Information (Reconciliation Of Segment Net Operating Income To Income From Continuing Operations) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Information
Total Segment Net Operating Income	$ 98,059	$ 95,992	$ 191,126	$ 189,537
Depreciation and Amortization	(39,609)	(37,685)	(78,040)	(73,542)
Impairment Loss	(18,892)	(15,825)	(19,662)	(16,061)
General and Administrative	(6,612)	(6,069)	(13,168)	(12,660)
Interest Expense, net	(37,324)	(37,280)	(74,170)	(74,719)
Interest and Other Income, net	1,423	972	3,478	3,835
Equity in Earnings (Loss) of Real Estate Joint Ventures and Partnerships, net	3,579	2,630	6,976	5,866
Loss on Redemption of Convertible Senior Unsecured Notes		(135)		(135)
Gain on Acquisition	4,559		4,559
Gain on Land and Merchant Development Sales	1		963
(Provision) Benefit for Income Taxes	(119)	320	197	(156)
Income from Continuing Operations	$ 5,065	$ 2,920	$ 22,259	$ 21,965

Depreciation of property, plant and equipment directly related to services rendered by an entity during the reporting period.

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Amount of the excess of the fair value of acquired net assets over the cost of an acquired business after pro rata reduction of the amounts that otherwise would have been assigned to acquired assets except financial assets other than investments accounted for by the equity method, assets to be disposed of by sale, deferred tax assets, prepaid assets relating to pension and postretirement benefit plans, and other current assets. This amount is considered an extraordinary item and often referred to as negative goodwill. This element is gross of the related tax effect.

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

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

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- Definition

This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.

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- Definition

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.

+ Details

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The charge against earnings from continuing operations resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Represents segment total revenues less (1) operating expense and (2) real estate tax expense (ad valorem taxes).

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