Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Common Stock Disclosures [Abstract]
Common shares of beneficial interest, shares authorized	500,000,000us-gaap_CommonStockSharesAuthorized	500,000,000us-gaap_CommonStockSharesAuthorized
Common shares of beneficial interest, par value (usd per share)	0.01	0.01
Preferred Stock Disclosures [Abstract]
Preferred shares of beneficial interest, shares authorized	100,000,000us-gaap_PreferredStockSharesAuthorized	100,000,000us-gaap_PreferredStockSharesAuthorized
Preferred shares of beneficial interest, par value (usd per share)	0.01	0.01
Preferred Stock, Shares Outstanding	14,000,000us-gaap_PreferredStockSharesOutstanding	14,000,000us-gaap_PreferredStockSharesOutstanding
Preferred shares of beneficial interest, redemption price per share (usd per share)	25.00
LTIP Units Disclosures [Abstract]
Operating Partnership outstanding	236,351	236,351
LTIP units, vested	9,469
6.50% Series C [Member]
Preferred Stock Disclosures [Abstract]
Preferred Stock, Shares Outstanding	5,000,000	5,000,000
Preferred Stock, Dividend Rate, Percentage	6.50%
Share cap on each preferred shares	2.0325
7.875% Series A [Member]
Preferred Stock Disclosures [Abstract]
Preferred Stock, Shares Outstanding	5,600,000	5,600,000
Preferred Stock, Dividend Rate, Percentage	7.875%
Share cap on each preferred shares	2.3234
8.00% Series B [Member]
Preferred Stock Disclosures [Abstract]
Preferred Stock, Shares Outstanding	3,400,000	3,400,000
Preferred Stock, Dividend Rate, Percentage	8.00%
Share cap on each preferred shares	3.4483
ATMProgram [Member]
Common Stock Disclosures [Abstract]
Mar 2014 Shelf Registration Stmt Maximum Amount	175.0
Sept 2012 Shelf Registration Stmt Maximum Amount	170.0
Amount Available under ATM Program	159.8

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Long term incentive partnership units outstanding.

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Long term incentive partnership units vested.

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Mar 2014 Shelf Registration Stmt Maximum Amount

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Sept 2012 Shelf Registration Stmt Maximum Amount

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Share cap on each preferred shares.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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The percentage rate used to calculate dividend payments on preferred stock.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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