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Net Income (Loss) Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average unvested restricted shares outstanding 385,587 357,018 387,542 358,253
Restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Dilutive restricted stock awards outstanding securities not participate in losses 0 0 0 0
Performance Shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Dilutive restricted stock awards outstanding securities not participate in losses 294,570 0 294,570 0