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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income attributable to common shareholders $ 14,392 $ 13,355 $ 24,055 $ 28,823
Dividends paid on unvested shares and units (64) (48) (171) (141)
Undistributed earnings allocated to unvested shares and units 0 0 0 0
Net income attributable to common shareholders $ 14,328 $ 13,307 $ 23,884 $ 28,682
Denominator:        
Weighted average number of common shares - basic (in shares) 39,298,974 38,307,382 38,731,900 38,293,704
Unvested shares (in shares) 251,520 260,080 228,555 226,985
Weighted average number of common shares - diluted (in shares) 39,550,494 38,567,462 38,960,455 38,520,689
Basic income per Common Share:        
Net income attributable to common shareholders per weighted average basic common share (in dollars per share) $ 0.36 $ 0.35 $ 0.62 $ 0.75
Diluted income per Common Share:        
Net income attributable to common shareholders per weighted average diluted common share (in dollars per share) $ 0.36 $ 0.35 $ 0.61 $ 0.74