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Capital Stock (Details) (USD $) | 0 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 19, 2012 | Sep. 07, 2012 | Jul. 11, 2012 | Jul. 12, 2012 | May 29, 2012 | May 15, 2012 | Apr. 04, 2012 | Mar. 23, 2012 | Jan. 10, 2012 | Dec. 29, 2011 | Sep. 07, 2012 | Sep. 09, 2011 | Jul. 09, 2012 | Dec. 31, 2011
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01
Common stock, shares authorized |  | 400,000,000 |  |  |  |  |  |  |  |  | 400,000,000 |  | 200,000,000 | 400,000,000
Stock Issued During Period, Shares, New Issues |  |  | 20,000,000 | 7,211,538 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 199,800,000 |  |  |  |  |  |  |  | $ 199,831,000 | $ 149,674,000 |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
Lock up agreement period (in days) |  |  |  | 150 days |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid, Day, Month and Year | Sep. 19, 2012 |  |  |  | May 29, 2012 |  | Apr. 04, 2012 |  | Jan. 10, 2012 |  |  |  |  |
Dividends Payable, Date of Record, Day, Month and Year |  | Sep. 07, 2012 |  |  |  | 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 |  | $ 0.08 |  |  |  |  |
Preferred stock, shares authorized |  | 10,000,000 |  |  |  |  |  |  |  |  | 10,000,000 |  |  | 10,000,000
Preferred stock, par value (in dollars per share) |  | $ 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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