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Stockholders' Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2013 | May 15, 2013 May 2013 Public Offering | May 15, 2013 May 2013 Public Offering Underwriter Overallotment Option | Sep. 30, 2014 ATM Sales Program | May 06, 2010 ATM Sales Program
Equity Offerings |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 100,187,405 |  |  |  |  |  |  | 100,187,405 |  |  |  |
Shares of common stock sold |  |  |  |  |  |  |  |  | 17,250,000 | 2,250,000 |  |
Price per share of common stock sold (in dollars per share) |  |  |  |  |  |  |  |  | $ 14.00 |  |  |
Proceeds from the issuance of common stock, net |  |  |  |  |  |  | $ 241,500,000 |  | $ 230,700,000 |  |  |
Offering related expenses incurred |  |  |  |  |  |  | 10,789,000 |  | 10,800,000 |  |  |
Maximum aggregate gross sales price of common stock |  |  |  |  |  |  |  |  |  |  | 34,300,000 | 75,000,000
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 | $ 19,036,000 | $ 19,035,000 | $ 19,036,000 | $ 19,036,000 | $ 15,758,000 | $ 15,758,000 |  |  |  |  |  |

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