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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income attributable to common shareholders $ 5,034 $ 12,168 $ 9,647 $ 15,468
Dividends paid on unvested shares and units (65) (48) (127) (94)
Undistributed earnings allocated to unvested shares and units 0 0 0 0
Net income attributable to common shareholders $ 4,969 $ 12,120 $ 9,520 $ 15,374
Denominator:        
Weighted average number of common shares - basic (in shares) 38,525,306 38,299,132 38,443,663 38,286,790
Unvested shares (in shares) 224,355 178,080 215,526 160,128
Weighted average number of common shares - diluted (in shares) 38,749,661 38,477,212 38,659,189 38,446,918
Basic income per Common Share:        
Net income attributable to common shareholders per weighted average basic common share (in dollars per share) $ 0.13 $ 0.32 $ 0.25 $ 0.40
Diluted income per Common Share:        
Net income attributable to common shareholders per weighted average diluted common share (in dollars per share) $ 0.13 $ 0.31 $ 0.25 $ 0.40