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Noncontrolling Interest of Unitholders in Operating Partnership - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
item
$ / shares
shares
Jun. 30, 2019
$ / shares
Dec. 31, 2019
shares
Noncontrolling Interest          
Distributions per unit | $ / shares     $ 0.5294 $ 0.5225  
Maximum          
Noncontrolling Interest          
Number of permitted exchange requests in a calendar year | item     2    
Limited Partnership          
Noncontrolling Interest          
Total units 18,239,000   18,239,000   17,811,000
Units converted by limited partners into common shares     0   0
Total units     1    
Limited Partnership | Minimum          
Noncontrolling Interest          
Number of units which can be redeemed in single redemption     1,000    
Operating Partnership          
Noncontrolling Interest          
Declared distributions | $ $ 4,828 $ 4,657