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Capital Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jan. 31, 2011 Follow On Public Offering [Member] | May 28, 2010 Follow On Public Offering [Member]
Capital Stock (Textuals) [Abstract] |  |  |  |  |
Common stock, shares authorized | 200,000,000 | 200,000,000 |  |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |
Common stock, shares sold |  |  |  | 12,418,662 | 23,000,000
Underwriters overallotment of shares |  |  |  | 1,418,662 | 3,000,000
Common stock offering price (in dollars per share) |  |  |  | $ 12.15 | $ 8.40
Net proceeds after deduction of offering cost (in dollars) | $ 149,632 | $ 209,690 | $ 204,975 | $ 149,600 | $ 184,600
Preferred stock, shares authorized | 10,000,000 | 10,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |
Preferred Stock, shares outstanding | 0 | 0 |  |  |
Units of Partnership Interest, Amount | 0 | 0 |  |  |
Operating Partnership Units Option To Redeem For Common Stock Ratio | 1 |  |  |  |

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