XML 94 R76.htm IDEA: XBRL DOCUMENT v3.24.0.1
Stock-based Compensation - (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2023
Jan. 31, 2023
Mar. 31, 2022
Jan. 31, 2022
Mar. 31, 2021
Jan. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
May 03, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Non-cash share compensation             $ 15,676 $ 15,672 $ 15,032  
2013 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)                   11,000,000
2013 Plan | Restricted common shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)             342,939 247,579 224,163  
Non-cash share compensation             $ 4,700 $ 3,900 $ 3,700  
Unrecognized compensation expense             $ 1,600 $ 1,400 $ 1,400  
Grant date value (in dollars per share)             $ 14.57 $ 16.53 $ 17.42  
2013 Plan | Restricted Share Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares) 355,388   299,019   265,275          
Non-cash share compensation             $ 10,800 $ 11,700 $ 11,200  
Unrecognized compensation expense             $ 8,800 $ 10,000 $ 12,000  
Number of dividend equivalent included in award (in shares)             1      
2013 Plan | Market Based RSU                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grant date value (in dollars per share)             $ 18.71 $ 30.17 $ 29.18  
2013 Plan | Performance based restricted stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grant date fair value (in dollars per share)             14.70 16.37 17.21  
Grant date value (in dollars per share)             $ 15.90 $ 20.51 $ 22.00  
Officers and Certain Employees | 2013 Plan | Restricted common shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)             342,939 247,579 224,163  
Share-based compensation, gross             $ 5,000 $ 4,100 $ 3,900  
Officers and Certain Employees | 2013 Plan | Restricted Share Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period             1 year      
Officers and Certain Employees | 2013 Plan | Market Based RSU                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of shares awarded             30.00% 30.00% 40.00%  
Officers and Certain Employees | 2013 Plan | Performance based restricted stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of shares awarded             70.00% 70.00% 60.00%  
Senior Management | 2013 Plan | Restricted common shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period             1 year 1 year 1 year  
Senior Management | 2013 Plan | Restricted Share Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period     3 years              
Employee | 2013 Plan | Restricted common shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period             3 years 3 years 3 years  
Officer | 2013 Plan | Restricted common shares | Share-Based Payment Arrangement, Tranche One                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period   1 year                
Officer | 2013 Plan | Restricted common shares | Share-Based Payment Arrangement, Tranche Two                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period   2 years                
Trustees | 2013 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)   11,274   7,800   13,343        
Trustees | 2013 Plan | Restricted Share Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares) 62,586   56,204   43,582          
Vesting period     2 years              
Number of dividend equivalent included in award (in shares)             1      
Trustees | 2013 Plan | Performance based restricted stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grant date fair value (in dollars per share)   $ 14.47   $ 18.83   $ 17.80