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Public Offerings of Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Public Offerings of Common Stock [Abstract] |  |  |  |
Common stock sold | 3,661 |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 | $ 0.001
Common stock, price per share | $ 19.25 |  |  |
Proceeds from issuance of common stock | $ 65,830 | $ 65,830 |  |

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