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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | May 02, 2006 | Dec. 23, 2011 Class F (2010) Units | Dec. 31, 2011 7.50% Series C Preferred Shares | Dec. 31, 2011 Series D Preferred Stock [Member] | Jan. 19, 2012 Dividend Declared | Jan. 05, 2012 Dividend Paid | Dec. 31, 2011 Series C Preferred Stock [Member] | Dec. 31, 2010 Series C Preferred Stock [Member] | Dec. 31, 2003 Series C Preferred Stock [Member] | Dec. 31, 2011 Series D Preferred Stock [Member] | Dec. 31, 2010 Series D Preferred Stock [Member] | Dec. 31, 2004 Series D Preferred Stock [Member] | Dec. 31, 2011 Subsidiaries [Member] | Dec. 13, 2011 Subsidiaries [Member] | Aug. 05, 2010 Subsidiaries [Member] Class F (2010) Units
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid for preferred shares | $ 7,992,000 | $ 7,992,000 | $ 7,992,000 |  |  | $ 900,000 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of Preferential return |  |  |  |  |  | 7.50% | 7.375% |  |  | 7.50% | 7.50% | 7.50% | 7.375% | 7.375% | 7.375% |  |  |
Proceeds from issuance of redeemable preferred shares (in dollars) |  |  |  |  |  |  |  |  |  |  |  | 48,100,000 |  |  | 55,500,000 |  |  |
Preferred shares, shares issued |  |  |  |  |  |  |  |  |  | 2,000,000 | 2,000,000 | 2,000,000 | 2,300,000 | 2,300,000 | 2,300,000 |  |  |
Preferred shares, redemption price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25 |  |  | $ 25.00 |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share | 2,698,647 | 9,902,752 | 2,809,108 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,111,112
Distribution Declared per common partnership unit |  |  |  |  |  |  |  | $ 0.15 |  |  |  |  |  |  |  |  | $ 0.15 |
Amount of dividend declared |  |  |  |  |  |  |  |  | 21,500,000 |  |  |  |  |  |  |  |  |
Shares authorized for Equity Offering Program | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of Gross sale price per share, compensation to sales agents | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest, shares | 679,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price per share | $ 12.18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Contributions from Parent | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | $ 8,272,000 | $ 71,981,000 | $ 242,323,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares available for sales | 8,578,447 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common partnership units issued to the parent company related to redemption |  |  |  |  | 7,111,112 |  |  |  |  |  |  |  |  |  |  | 679,285 |  |
Common Partnership Units Issued | 6,421,553 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares capacity restored |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares Expected to be purchased under program | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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