FAIR VALUE DISCLOSURES (Details 2) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Fair Value of Financial Instruments
Note receivable from Preferred Operating Partnership unit holder	$ 100,000	$ 100,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value of Financial Instruments
Note receivable from Preferred Operating Partnership unit holder	95,582	115,696
Fixed rate notes payable and notes payable to trusts	791,198	777,575
Exchangeable senior notes	92,383	118,975
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value of Financial Instruments
Note receivable from Preferred Operating Partnership unit holder	100,000	100,000
Fixed rate notes payable and notes payable to trusts	757,921	731,588
Exchangeable senior notes	$ 87,663	$ 87,663

Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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