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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
$ / shares
Jun. 30, 2019
USD ($)
$ / 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     $ 113.74 $ 98.71  
Total compensation cost for option and share awards | $ $ 4,700 $ 4,700 $ 9,300 $ 9,300  
Total capitalized compensation cost for option and share awards | $ 1,000 $ 900 1,900 1,800  
Share Awards and Vesting [Member]          
Total unrecognized compensation cost which is expected to be amortized | $ $ 20,100   $ 20,100    
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans     3 years    
Fair value of shares vested | $     $ 18,400 $ 20,700  
Maximum [Member] | Share Awards and Vesting [Member]          
Vesting period, years     3 years    
Two Thousand Eighteen Share Incentive Plan [Member]          
Total common shares available | shares 6,900,000   6,900,000   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 | shares     1.0    
Full Value award in the common share conversion ratio | shares     1.0    
Common shares which could be granted pursuant to full value awards | shares 2,000,000.0   2,000,000.0