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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
shares
$ / shares
Sep. 30, 2018
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     $ 98.78 $ 82.77  
Total compensation cost for option and share awards | $ $ 4,000 $ 4,400 $ 13,300 $ 13,200  
Total capitalized compensation cost for option and share awards | $ 800 $ 700 2,600 2,400  
Share Awards and Vesting [Member]          
Total unrecognized compensation cost which is expected to be amortized | $ $ 16,600   $ 16,600    
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans     2 years    
Fair value of shares vested | $     $ 25,500 $ 24,000  
Maximum [Member] | Share Awards and Vesting [Member]          
Vesting period, years     3 years    
Two Thousand Eighteen Share Incentive Plan [Member]          
Total common shares available | shares 7,500,000   7,500,000   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 | 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 2,200,000   2,200,000