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Net Income (Loss) Per Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net Income (Loss) Per Share [Abstract]        
Dilutive restricted stock awards outstanding securities not participate in losses 0 0 0 0
Weighted average unvested restricted shares outstanding 357,018 374,842 358,253 384,614