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Stockholders' Equity (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2010 | May 06, 2010
Stockholders' Equity |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 82,937,405 |  |  |  |  |  | 81,437,405 |
Maximum aggregate gross sales price of common stock allowed under the ATM Sales Program |  |  |  |  |  |  |  | $ 75,000,000
Shares of common stock sold under the ATM Sales Program (in shares) | 1,500,000 |  |  |  |  |  |  |
Dividends declared and paid |  |  |  |  |  |  |  |
Dividends Per Share (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |  |
Total Dividends | 15,473,000 | 15,473,000 | 15,473,000 | 15,139,000 | 15,140,000 | 15,139,000 |  |
Issuance of shares |  |  |  |  |  |  |  |
Average price per share of common stock sold under the Sales Program (in dollars per share) | $ 12.00 |  |  |  |  |  |  |
Amount payable to the placement/sales agent | 360,000 |  |  |  |  |  |  |
Offering related expenses incurred | 256,000 |  |  |  |  |  |  |
Proceeds from the issuance of common stock, net | $ 17,400,000 |  |  |  |  |  |  |

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