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Stockholders' Equity (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2010 | May 06, 2010
Stockholders' Equity |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 81,437,405 |  |  |  | 81,437,405 |
Maximum aggregate gross sales price of common stock allowed under the ATM Sales Program |  |  |  |  |  | $ 75,000,000
Dividends declared and paid |  |  |  |  |  |
Dividends Per Share (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |  |
Total Dividends | $ 15,473,000 | $ 15,473,000 | $ 15,140,000 | $ 15,139,000 |  |

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