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Capital Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 27, 2011 | Apr. 07, 2011 | Sep. 09, 2011 | Jun. 17, 2011 | Mar. 25, 2011 | Sep. 09, 2011 | Sep. 10, 2010 | Dec. 31, 2010 | Sep. 20, 2011 Dividend Paid [Member] | Mar. 25, 2011 Follow On Public Offering [Member]
Capital Stock (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 200,000,000 |  |  | 200,000,000 |  | 200,000,000 |  |
Common stock, par value |  |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |
Common stock, shares sold |  |  |  |  |  |  |  |  |  | 12,418,662
Underwriters overallotment of shares |  |  |  |  |  |  |  |  |  | 1,418,662
Common stock offering price |  |  |  |  |  |  |  |  |  | $ 12.07
Net proceeds after deduction of offering cost |  |  |  |  |  | $ 149,674 | $ 209,817 |  |  | $ 149,700
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.08 | $ 0.08 | $ 0.08 |  |  |  |  |
Dividends Payable, Date of Record, Day, Month and Year |  |  | Sep. 09, 2011 | Jun. 17, 2011 | Mar. 25, 2011 |  |  |  |  |
Dividends Payable, Date to be Paid, Day, Month and Year | Jun. 27, 2011 | Apr. 07, 2011 |  |  |  |  |  |  | Sep. 20, 2011 |
Common Stock, Dividends, Per Share, Cash Paid |  |  | $ 0.08 | $ 0.08 | $ 0.08 |  |  |  |  |
Preferred stock, shares authorized |  |  | 10,000,000 |  |  | 10,000,000 |  | 10,000,000 |  |
Preferred stock, par value |  |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |
Preferred Stock, shares outstanding |  |  | 0 |  |  | 0 |  | 0 |  |
Units of Partnership Interest, Amount |  |  | 0 |  |  | 0 |  | 0 |  |
Operating Partnership Units Option To Redeem For Common Stock Ratio |  |  |  |  |  | 1 |  |  |  |

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