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Equity (Details Textuals) (USD $) In Thousands, except Per Share data | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2011 | Jun. 30, 2010 | Jun. 17, 2011 | Mar. 16, 2011 | Jun. 18, 2010 | May 19, 2010
Equity (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.42 | $ 0.36 |  |  |  |
Total dividend paid |  |  |  |  |  |  |  |  |  | $ 23,976 | $ 23,897 | $ 20,209 | $ 20,046

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