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Stock-based Compensation - Restricted Share Units (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-cash share compensation         $ 9,161 $ 7,861  
2013 Plan | Restricted share units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of dividend equivalent included in each award (in shares)             1
Non-cash share compensation     $ 2,200 $ 1,700 6,500 $ 5,300  
Unrecognized compensation expense     $ 12,400   $ 12,400    
2013 Plan | Trustee Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)         38,858    
Granted (in dollars per share)         $ 19.30    
2013 Plan | Performance based restricted stock units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in dollars per share) $ 24.36            
Performance conditions grant date fair value (in dollars per share) $ 19.30            
Officers and Certain Employees | 2013 Plan | Restricted share units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares) 482,646            
Vesting period 3 years            
Officers and Certain Employees | 2013 Plan | Market Based Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 40.00%            
Officers and Certain Employees | 2013 Plan | Performance based restricted stock units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage 60.00%            
Percentage of restricted share units issued to trustees   100.00%          
Trustees | 2013 Plan | Restricted share units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 2 years            
Trustees | 2013 Plan | Trustee Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares) 38,858            
Officer | 2013 Plan | Restricted share units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 5 years            
Minimum | 2013 Plan | Market Based Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in dollars per share) $ 26.80            
Maximum | 2013 Plan | Market Based Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in dollars per share) $ 37.09