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Earnings (Loss) Per Share and Stockholders' Equity (Stockholders' Equity Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Aug. 01, 2016
Aug. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Public offering related to equity forward transaction, shares   8,600,000    
Forward rate per share   $ 25.25    
Shares subject to forward sale agreement   4,300,000    
Optional shares available to underwriters   1,290,000    
Shares of common stock issued 5,590,000      
Proceeds from issuance of common stock $ 134,700   $ 4,618 $ 3,779