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Equity Incentive Plans (Summary Of Restricted Share Unit Activity) (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-employee Trustee Length of Period Subsequent to Grant Date Options Not Exercisable 1 year
Range of settlement date for shares for non-employee trustee from grant date, minimum 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Number of Shares, Outstanding at December 31, 2018 | shares 655,056
Number of Shares, Granted | shares 208,755
Number of Shares, Vested | shares (337,910)
Number of Shares, Outstanding at June 30, 2019 | shares 517,573
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2018 | $ / shares $ 64.16
Weighted Average Grant Date Fair Value, Granted | $ / shares 74.13
Weighted Average Grant Date Fair Value, Vested | $ / shares 64.61
Weighted Average Grant Date Fair Value, Outstanding at June 30, 2019 | $ / shares $ 67.86
Unamortized share-based compensation expense | $ $ 21.5
Weighted Average Life Remaining, Outstanding at June 30, 2019 (in years) 1 year 4 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Restricted Share Units [Member]  
Range of settlement date for shares for non-employee trustee from grant date, minimum 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Number of Shares, Outstanding at December 31, 2018 | shares 23,571
Number of Shares, Granted | shares 27,392
Number of Shares, Vested | shares (24,727)
Number of Shares, Outstanding at June 30, 2019 | shares 26,236
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2018 | $ / shares $ 61.25
Weighted Average Grant Date Fair Value, Granted | $ / shares 77.19
Weighted Average Grant Date Fair Value, Vested | $ / shares 61.62
Weighted Average Grant Date Fair Value, Outstanding at June 30, 2019 | $ / shares $ 77.54
Unamortized share-based compensation expense | $ $ 1.9
Weighted Average Life Remaining, Outstanding at June 30, 2019 (in years) 28 days
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years