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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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income                 $ 30,641 $ 29,478 $ 31,483
Dividends paid on unvested shares and LTIP units                 (310) (235) (189)
Net income attributable to common shareholders $ (174) $ 14,580 $ 13,387 $ 2,848 $ 5,438 $ 14,393 $ 5,034 $ 4,613 $ 30,331 $ 29,243 $ 31,294
Denominator:                      
Weighted average number of common shares - basic (in shares) 46,513,688 46,149,765 45,867,625 45,753,792 43,205,683 39,298,974 38,525,306 38,361,113 46,073,515 39,859,143 38,299,067
Effect of dilutive securities:                      
Unvested shares (in shares)                 170,145 253,123 183,808
Weighted average number of common shares - diluted (In shares) 46,765,797 46,384,969 46,084,688 46,022,690 43,522,022 39,550,494 38,749,661 38,573,928 46,243,660 40,112,266 38,482,875
Basic income per Common Share:                      
Net income attributable to common shareholders per weighted average common share (in dollars per share) $ 0.00 $ 0.31 $ 0.29 $ 0.06 $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.66 $ 0.73 $ 0.82
Diluted income per Common Share:                      
Net income attributable to common shareholders per weighted average common share (in dollars per share) $ 0.00 $ 0.31 $ 0.29 $ 0.06 $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.66 $ 0.73 $ 0.81