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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Acceleration of share-based payment arrangement $ 500 $ 2,900 $ 2,600 $ 12,400  
Unrecognized compensation cost $ 76,800   $ 76,800    
Compensation recognition period (in years)     3 years    
Stock options granted (in shares)     177,168    
Exercised (in shares)     178,511    
Stock options forfeited (in shares)     45,315    
Stock options outstanding (in shares) 3,117,825   3,117,825   3,164,483
Share-based compensation expense $ 9,515 13,741 $ 31,309 44,597  
Non-Management Trustee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted (in shares)     60,000    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period (in years)     10 years    
Share-based compensation expense $ 3,600 4,200 $ 11,300 15,800  
Performance Target, Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted (in shares)     117,168    
Award performance period     3 years    
Percentage of target options originally granted (as percent) 200.00%   200.00%    
Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 6,300 $ 9,700 $ 21,100 $ 30,600  
Grants in period (in shares)     42,452    
Forfeited in period (in shares)     30,148    
Vested (in shares)     77,400    
Employee stock-based compensation and exercise of stock options (in shares)     55,595    
Restricted share units outstanding (in shares) 410,951   410,951   476,047
Performance Target, Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period     3 years    
Grants in period (in shares)     37,211    
Percentage of target options originally granted (percentage) 200.00%   200.00%    
Service-Based Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)     5,241    
Deferred Stock Units (DSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)     1,590    
Restricted share units outstanding (in shares) 10,274   10,274   9,551
Granted DSUs (in shares)     867    
Unrestricted Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)     674    
Minimum | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     3 years    
Minimum | Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     5 years    
Maximum | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     5 years    
Maximum | Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     8 years