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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 23, 2021
USD ($)
trustee
$ / shares
shares
Jan. 25, 2021
$ / shares
shares
Sep. 16, 2020
USD ($)
$ / shares
shares
Jun. 23, 2020
USD ($)
trustee
$ / shares
shares
Jan. 27, 2020
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
tranche
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock issued (in shares)           121,511,102   121,511,102   121,522,555
Compensation expense, accelerated vesting due to a staffing reduction | $               $ 3,500 $ 17  
Common shares available for issuance (in shares)           1,526,730   1,526,730    
General and Administrative Expense                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expense | $           $ 3,000 $ 3,300 $ 12,600 $ 9,900  
Restricted Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period               4 years    
Number of independent trustees | trustee 6     9            
Number of equity awards granted (in shares) 18,505 122,466 2,526 19,104 85,058          
Exercise price (in dollars per share) | $ / shares $ 27.02     $ 31.41            
Granted shares value (in dollars per share) | $ / shares     $ 30.39              
Stock issued during period, value | $     $ 100              
RSUs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period               3 years    
Number of tranches | tranche               2    
Share-based compensation arrangement (in shares)               523,662 388,615  
Common stock issued (in shares)           523,662 388,615 523,662 388,615  
RSUs | Vesting in three years                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting percent               50.00%    
RSUs | Vesting in four years                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period               1 year    
Vesting percent               50.00%    
RSUs at target                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity awards granted (in shares)   248,646     172,697          
RSUs at maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity awards granted (in shares)   619,750     430,447          
LTIP Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Conversion basis           1   1    
Time-based LTIP Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity awards granted (in shares) 3,701     9,552 20,116          
Time-based LTIP Units | Independent Trustee                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity awards granted (in shares) 3,701     3,184            
Market-Based LTIP Units, Target                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity awards granted (in shares)         40,841          
Market-Based LTIP Units, Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity awards granted (in shares)         101,796          
Restricted Shares and Time-Based LTIP Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period 1 year                  
Share based compensation amount | $ $ 100     $ 100            
Granted shares value (in dollars per share) | $ / shares   $ 28.25                
Estimated future compensation expense for unvested shares | $           $ 5,900   $ 5,900    
Weighted average period over which compensation expense will be recorded               2 years 4 months 24 days    
Time-Based LTIP Units and Restricted Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted shares value (in dollars per share) | $ / shares         $ 32.81          
RSUs and Market-Based LTIP Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted shares value (in dollars per share) | $ / shares         $ 40.17     $ 37.87    
Estimated future compensation expense for unvested shares | $           $ 12,400   $ 12,400    
Weighted average period over which compensation expense will be recorded               2 years 2 months 12 days