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Stockholders' Equity (Details) (USD $) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2011 | Sep. 30, 2012 ATM Sales Program | May 06, 2010 ATM Sales Program
Equity Offerings |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 82,937,405 |  |  |  |  |  | 82,937,405 |  |
Maximum aggregate gross sales price of common stock |  |  |  |  |  |  |  |  | $ 75,000,000
Common stock available to be sold under the plan |  |  |  |  |  |  |  | 34,300,000 |
Dividends declared and paid |  |  |  |  |  |  |  |  |
Dividends Per Share | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |  |  |
Total Dividends | $ 15,758,000 | $ 15,758,000 | $ 15,758,000 | $ 15,473,000 | $ 15,473,000 | $ 15,473,000 |  |  |

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