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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