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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2026
USD ($)
shares
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
Feb. 25, 2026
$ / shares
shares
Dec. 31, 2025
$ / shares
shares
May 17, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 108.84 $ 118.90      
Total compensation cost for option and share awards | $ $ 4,800 $ 4,200      
Total capitalized compensation cost for option and share awards | $ $ 600 900      
Individual Potential Target Award Minimum 0.00%        
Individual Potential Target Award Maximum 200.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 109.63     $ 110.16  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 252,908     236,669  
Market Conditions          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares     $ 120.42    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number     25,463    
Performance Conditions          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares     $ 108.84    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number     25,464    
Market and Performance Conditions          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number     50,927    
Share Awards and Vesting [Member]          
Total unrecognized compensation cost which is expected to be amortized | $ $ 25,800        
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans 3 years        
Fair value of shares vested | $ $ 21,600 $ 22,800      
Maximum [Member] | Share Awards and Vesting [Member]          
Vesting period, years 3 years        
Two Thousand Eighteen Share Incentive Plan [Member]          
Total common shares available 2,500,000       9,700,000
Common shares To Full Value Award Conversion Ratio 3.45        
Value Of Option Right Or Other Award In The Fungible Unit Conversion 1.0        
Full Value award in the common share conversion ratio 1.0        
Common shares which could be granted pursuant to full value awards 700,000