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Operating Partnerships Operating Partnerships (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended
	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012 Oasis Martinique Llc [Member]
Number of perpetual preferred units redeemed	4.0
Dividend percentage of perpetual preferred units	7.00%
Perpetual preferred units Redemption Price Per Share	$ 25.00
Aggregated redemption value of perpetual preferred units	$ 100,000,000
Write off of original issuance costs of redeemed perpetual preferred units	$ 2,100,000	$ 0	$ 0	$ 2,075,000	$ 0
Units Converted To Shares During Period						0.3
Resultant number of common shares from exchange of operating interest units						0.2

X

- Definition

The number of limited partner units converted to common shares during the period.

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Write off of original issuance costs of redeemed perpetual preferred units which were unamortized as of the date of redemption of the perpetual preferred units.

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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