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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income attributable to common shareholders $ 10,002 $ 14,580 $ 21,052 $ 30,813
Dividends paid on unvested shares and units (107) (81) (299) (229)
Net income attributable to common shareholders $ 9,895 $ 14,499 $ 20,753 $ 30,584
Denominator:        
Weighted average number of common shares - basic (in shares) 46,913,922 46,149,765 46,744,890 45,925,178
Unvested shares (in shares) 238,244 235,204 212,074 153,380
Weighted average number of common shares - diluted (in shares) 47,152,166 46,384,969 46,956,964 46,078,558
Basic income per Common Share:        
Net income attributable to common shareholders per weighted average basic common share (in dollars per share) $ 0.21 $ 0.31 $ 0.44 $ 0.67
Diluted income per Common Share:        
Net income attributable to common shareholders per weighted average diluted common share (in dollars per share) $ 0.21 $ 0.31 $ 0.44 $ 0.66