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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 23, 2020
USD ($)
trustee
$ / shares
shares
Jan. 27, 2020
$ / shares
shares
Jun. 20, 2019
USD ($)
trustee
$ / shares
shares
Jan. 29, 2019
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
tranche
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock issued (in shares)         121,521,624   121,521,624   121,924,199
Compensation expense, accelerated vesting due to a staffing reduction | $         $ 0 $ 300 $ 18 $ 800  
Common shares available for issuance (in shares)         2,291,799   2,291,799    
General and Administrative Expense                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense | $         $ 3,300 $ 3,700 $ 6,600 $ 7,600  
Restricted shares                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period             4 years    
Number of equity awards granted (in shares) 19,104 85,058 23,520 112,359          
Exercise price (in dollars per share) | $ / shares       $ 31.77          
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)             387,729 382,413  
Common stock issued (in shares)         387,729 382,413 387,729 382,413  
Exercise price (in dollars per share) | $ / shares       $ 39.65          
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)   172,697   228,128          
RSUs at maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of equity awards granted (in shares)   430,447   568,609          
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) 9,552 20,116 2,940            
Market-based LTIP Units, at 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, at 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   1 year            
Number of trustees in board of trustees | trustee 9   9            
Stock issued during period, value | $ $ 100   $ 100            
Number of equity awards granted (in shares) 3,184   2,940            
Granted shares value (in dollars per share) | $ / shares   $ 32.81         $ 40.17    
Exercise price (in dollars per share) | $ / shares $ 31.41   $ 34.01            
Estimated future compensation expense for unvested shares | $         $ 8,100   $ 8,100    
Weighted average period over which compensation expense will be recorded             2 years 6 months    
RSUs and market-based LTIP units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Estimated future compensation expense for unvested shares | $         $ 15,900   $ 15,900    
Weighted average period over which compensation expense will be recorded             2 years 4 months 24 days