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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net income                 $ 29,478 $ 31,483 $ 32,966
Dividends paid on unvested shares and LTIP units                 (235) (189) (151)
Net income attributable to common shareholders $ 5,438 $ 14,393 $ 5,034 $ 4,613 $ 2,660 $ 13,355 $ 12,168 $ 3,300 $ 29,243 $ 31,294 $ 32,815
Denominator:                      
Weighted average number of common shares - basic 43,205,683 39,298,974 38,525,306 38,361,113 38,315,040 38,307,382 38,299,132 38,274,448 39,859,143 38,299,067 37,917,871
Effect of dilutive securities:                      
Unvested shares                 253,123 183,808 404,414
Weighted average number of common shares - diluted 43,522,022 39,550,494 38,749,661 38,573,928 38,525,598 38,768,638 38,734,987 38,671,129 40,112,266 38,482,875 38,322,285
Basic income per Common Share:                      
Net income attributable to common shareholders per weighted average common share (in dollars per share) $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.07 $ 0.35 $ 0.32 $ 0.09 $ 0.73 $ 0.82 $ 0.87
Diluted income per Common Share:                      
Net income attributable to common shareholders per weighted average common share (in dollars per share) $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.07 $ 0.34 $ 0.31 $ 0.08 $ 0.73 $ 0.81 $ 0.86