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Capital Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 17, 2011 | Mar. 25, 2011 | Jun. 17, 2011 | Jun. 18, 2010 | Dec. 31, 2010
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
Net proceeds after deduction of offering cost |  |  | $ 149,674 | $ 209,864 |
Common Stock, Dividends, Per Share, Declared | $ 0.08 | $ 0.08 |  |  |
Dividends Payable, Date Declared, Day, Month and Year |  | Mar. 25, 2011 |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 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
Units of Partnership Interest, Amount | 0 |  | 0 |  | 0
Operating Partnership Units Option To Redeem For Common Stock Ratio |  |  | 1 |  |
Dividend Paid [Member] |  |  |  |  |
Capital Stock (Textuals) [Abstract] |  |  |  |  |
Subsequent Event, Date | Jun. 27, 2011 |  |  |  |
Follow On Public Offering [Member] |  |  |  |  |
Capital Stock (Textuals) [Abstract] |  |  |  |  |
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 |  | $ 149,700 |  |  |

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