FAIR VALUE DISCLOSURES (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value of Financial Instruments
Note receivable from Preferred Operating Partnership unit holder	$ 100,000	$ 100,000
Fair Value
Fair Value of Financial Instruments
Note receivable from Preferred Operating Partnership unit holder	104,276	108,138
Fixed rate notes payable and notes payable to trusts	1,258,731	1,342,957
Exchangeable senior notes	231,250
Carrying Value
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	1,257,954	1,275,605
Exchangeable senior notes	$ 250,000

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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