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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 04, 2022
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Accelerated compensation expense | $   $ 2,900 $ 4,800 $ 12,400 $ 15,800  
Unrecognized compensation cost | $   $ 96,800   $ 96,800    
Compensation recognition period (in years)       3 years    
Anti-dilution adjustments of outstanding stock options, convertible, conversion ratio 1.03275          
Share-based compensation arrangement by share-based payment award, options, outstanding, number, increase (decrease)(in shares) 104,348          
Stock options granted (in shares)       142,683    
Stock options exercised (in shares)       146,608    
Stock options forfeited (in shares)       0    
Stock options incremental payout (in shares)   61,250   61,250    
Stock options outstanding (in shares)   3,201,624   3,201,624   3,039,951
Share-based compensation expense | $   $ 13,741 14,595 $ 44,597 47,685  
Special Dividend            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, dividends, per share, cash paid (in USD per share) | $ / shares $ 13.15          
Non-Management Trustee            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted (in shares)       65,000    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period (in years)       10 years    
Share-based compensation expense | $   $ 4,200 5,500 $ 15,800 20,500  
Performance Target, Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted (in shares)       77,683    
Award performance period       3 years    
Percentage of target options originally granted (percentage)   200.00%   200.00%    
Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense | $   $ 9,700 $ 9,600 $ 30,600 $ 29,400  
Grants in period (in shares)       27,943    
Forfeited in period (in shares)       18,487    
Vested (in shares)       76,818    
Issuance of common shares in connection with share-based compensation, net of taxes paid upon net share settlement of restricted share units (in shares)       55,079    
Restricted share units outstanding (in shares)   503,460   503,460   570,822
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)       21,985    
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)       5,958    
Deferred Stock Units (DSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period (in shares)       1,742    
Unrestricted Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period (in shares)       310    
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