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Earnings Per Share and Earnings Per Unit - Additional Information (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
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator for earnings per share - basic:                        
Net income (loss) $ 10,187 $ 12,539 $ 10,331 $ 6,716 $ 8,620 $ 10,294 $ 7,184 $ 5,424   $ 39,773 $ 31,522 $ 12,741
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]                        
Operating Partnership                   (1,136) (825) (576)
Partially owned properties [1]                   (491) (716) (377)
Preferred distributions                   (731) (1,857) (1,189)
Net income attributable to common shareholders 9,536 12,018 9,670 6,191 7,825 9,427 6,486 4,386   37,415 28,124 10,599
Numerator for earnings per share - diluted:                        
Net income attributable to common shareholders $ 9,536 $ 12,018 $ 9,670 $ 6,191 $ 7,825 $ 9,427 $ 6,486 $ 4,386   37,415 28,124 10,599
Operating Partnership net income                   1,136 825 576
Numerator for earnings per share - diluted                   $ 38,551 $ 28,949 $ 11,175
Weighted average number of shares outstanding - basic (in shares)                   163,123,109 163,123,109  
Denominator for earnings per share - basic and diluted:                        
Weighted average number of shares outstanding - basic (in shares) 179,683,948 177,847,424 155,366,080 138,986,629 135,581,976 134,608,396 131,481,329 102,704,008   163,123,109 126,143,114 72,750,724
Effect of dilutive securities:                        
Noncontrolling interest - Operating Partnership units                   4,839,967 3,692,095 3,708,494
Weighted average number of shares outstanding - diluted (in shares) 185,273,236 183,298,145 161,012,360 142,605,930 139,602,349 138,880,787 135,944,722 107,148,380   168,231,299 130,466,893 76,792,073
Earnings per share/unit, basic and diluted:                        
Earnings per share - basic (in dollars per share) $ 0.05 $ 0.07 $ 0.06 $ 0.04 $ 0.06 $ 0.07 $ 0.05 $ 0.04   $ 0.23 $ 0.22 $ 0.15
Earnings per share - diluted (in dollars per share) $ 0.05 $ 0.07 $ 0.06 $ 0.04 $ 0.06 $ 0.07 $ 0.05 $ 0.04   $ 0.23 $ 0.22 $ 0.15
Restricted shares                        
Effect of dilutive securities:                        
Effect of dilutive securities, restricted shares and RSUs                   89,497 205,036 190,619
Restricted share units                        
Effect of dilutive securities:                        
Effect of dilutive securities, restricted shares and RSUs                   178,726 426,648 142,236
Operating Partnership                        
Numerator for earnings per share - basic:                        
Net income (loss) $ 10,187 $ 12,539 $ 10,331 $ 6,716 $ 8,620 $ 10,294 $ 7,184 $ 5,424   $ 39,773 $ 31,522 $ 12,741
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]                        
Partially owned properties                   (491) (716) (377) [1]
Preferred distributions                   (731) (1,857) (1,189)
Net income attributable to common shareholders 9,849 12,380 9,984 6,338 8,021 9,682 6,687 4,559   38,551 28,949 11,175
Numerator for earnings per unit - basic and diluted                   38,551 28,949 11,175
Numerator for earnings per share - diluted:                        
Net income attributable to common shareholders $ 9,849 $ 12,380 $ 9,984 $ 6,338 $ 8,021 $ 9,682 $ 6,687 $ 4,559   $ 38,551 $ 28,949 $ 11,175
Denominator for earnings per share - basic and diluted:                        
Weighted average number of units outstanding - basic (in shares) 185,048,580 183,227,405 160,765,345 142,172,746 139,018,183 138,227,384 135,351,672 106,550,467 76,459,218 167,963,076 129,835,209 76,459,218
Effect of dilutive securities:                        
Weighted average number of units outstanding - diluted (in shares) 185,273,236 183,298,145   142,605,930   138,880,787 135,944,722 107,148,380 76,792,073 168,231,299 130,466,893 76,792,073
Earnings per share/unit, basic and diluted:                        
Earnings per share - basic (in dollars per share) $ 0.05 $ 0.07 $ 0.06 $ 0.04 $ 0.06 $ 0.07 $ 0.05 $ 0.04        
Earnings per share - diluted (in dollars per share) $ 0.05 $ 0.07 $ 0.06 $ 0.04 $ 0.06 $ 0.07 $ 0.05 $ 0.04        
Earnings per unit - basic (in dollars per share)                 $ 0.15 $ 0.23 $ 0.22 $ 0.15
Earnings per unit - diluted (in dollars per share)                 $ 0.15 $ 0.23 $ 0.22 $ 0.15
Operating Partnership | Restricted shares                        
Effect of dilutive securities:                        
Effect of dilutive securities, restricted shares and RSUs                 190,619 89,497 205,036  
Operating Partnership | Restricted share units                        
Effect of dilutive securities:                        
Effect of dilutive securities, restricted shares and RSUs                 142,236 178,726 426,648  
[1] adjustment of $0.3 million and $0.1 million was required for net income attributable to redeemable noncontrolling interests for the year ended December 31, 2017 and December 31, 2016, respectively. No such adjustment was required for the year ended December 31, 2015.