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Stockholders' Equity (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Aug. 20, 2014 | Aug. 17, 2012
Stockholders' Equity Note [Abstract] |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01
Maximum price of common stock available to be issued |  |  |  | $ 500,000,000 | $ 500,000,000
Commission to sales agent (as a percent) |  |  |  |  | 2.00%
Common stock sold (in shares) | 2,456,956 | 2,961,903 |  |  |
Proceeds from sale | 173,011,000 | 177,896,000 |  |  |
Shares issued during the period | $ 171,102,000 | $ 175,649,000 |  |  |

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