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Earnings Per Share - Reconciliation of Amounts Used in Calculating Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income attributable to common shareholders $ 2,848 $ 4,613
Dividends paid on unvested shares and units (63) (42)
Undistributed earnings allocated to unvested shares and units 0 0
Net income attributable to common shareholders $ 2,785 $ 4,571
Denominator:    
Weighted average number of common shares - basic (in shares) 45,753,792 38,361,113
Unvested shares (in shares) 268,898 212,815
Weighted average number of common shares - diluted (in shares) 46,022,690 38,573,928
Basic income per Common Share:    
Net income attributable to common shareholders per weighted average basic common share (in dollars per share) $ 0.06 $ 0.12
Diluted income per Common Share:    
Net income attributable to common shareholders per weighted average diluted common share (in dollars per share) $ 0.06 $ 0.12