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Stock-based Compensation - Restricted Share Units (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-cash share compensation         $ 5,338 $ 4,619
2013 Plan | Restricted share units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-cash share compensation     $ 1,800 $ 1,200 3,600 $ 3,100
Unrecognized compensation expense     $ 9,400   $ 9,400  
2013 Plan | Performance based restricted stock units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in dollars per share) $ 25.27          
Performance conditions grant date fair value (in dollars per share) $ 17.89          
Officers and Certain Employees | 2013 Plan | Restricted share units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 229,884          
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 50.00%          
Granted (in dollars per share) $ 29.60          
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 50.00%          
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]            
Granted (in shares) 41,925          
Vesting period   2 years        
Director | 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   1  
Market Condition Number Two | 2013 Plan | Market Based Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in dollars per share) $ 35.70