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Capital Stock (Details) (USD $) | 0 Months Ended | 6 Months Ended |  |  | 0 Months Ended
--- | --- | --- | --- | --- | ---
May 29, 2012 | Apr. 04, 2012 | Jan. 10, 2012 | Jun. 15, 2012 | Jun. 17, 2011 | Dec. 31, 2011 | Jul. 09, 2012 Issuance of Equity [Member] | Jul. 11, 2012 Follow On Public Offering [Member] | Jul. 12, 2012 Private Placement [Member]
Capital Stock (Textuals) [Abstract] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.01 |  | $ 0.01 |  |  |
Common stock, shares authorized |  |  |  | 200,000,000 |  | 200,000,000 | 400,000,000 |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  | 20,000,000 | 7,211,538
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  | $ 75,000,000
Proceeds from Issuance of Common Stock |  |  |  | $ 0 | $ 149,674,000 |  |  | $ 200,100,000 |
Lock up agreement period (in days) |  |  |  |  |  |  |  |  | 150 days
Dividends Payable, Date to be Paid, Day, Month and Year | May 29, 2012 | Apr. 04, 2012 | Jan. 10, 2012 |  |  |  |  |  |
Dividends Payable, Date of Record, Day, Month and Year | May 15, 2012 | Mar. 23, 2012 | Dec. 30, 2011 |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) | $ 0.08 | $ 0.08 | $ 0.08 |  |  |  |  |  |
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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