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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income attributable to common shareholders $ 14,580 $ 14,392 $ 30,813 $ 24,055
Dividends paid on unvested shares and units (81) (64) (229) (171)
Net income attributable to common shareholders $ 14,499 $ 14,328 $ 30,584 $ 23,884
Denominator:        
Weighted average number of common shares - basic (in shares) 46,149,765 39,298,974 45,925,178 38,731,900
Unvested shares (in shares) 235,204 251,520 153,380 228,555
Weighted average number of common shares - diluted (in shares) 46,384,969 39,550,494 46,078,558 38,960,455
Basic income per Common Share:        
Net income attributable to common shareholders per weighted average basic common share (in dollars per share) $ 0.31 $ 0.36 $ 0.67 $ 0.62
Diluted income per Common Share:        
Net income attributable to common shareholders per weighted average diluted common share (in dollars per share) $ 0.31 $ 0.36 $ 0.66 $ 0.61