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Equity Incentive Plans (Summary Of Restricted Share Unit Activity) (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Number of Shares, Outstanding at December 31, 2012 | shares 468,451
Number of Shares, Granted | shares 218,285
Number of Shares, Vested | shares (295,487)
Number of Shares, Outstanding at March 31, 2013 | shares 390,441
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2012 $ 49.29
Weighted Average Grant Date Fair Value, Granted 60.69
Weighted Average Grant Date Fair Value, Vested 50.37
Weighted Average Grant Date Fair Value, Outstanding at March 31, 2013 $ 54.84
Weighted Average Life Remaining, Outstanding at March 31, 2013 (in years) 1 year 1 month 18 days
Range of settlement date for shares for non-employee trustee from grant date, minimum (in years) 1 year
Unamortized share-based compensation expense | $ $ 13,700
Restricted Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Number of Shares, Outstanding at December 31, 2012 | shares 19,685
Number of Shares, Granted | shares 18,036
Number of Shares, Vested | shares (19,685)
Number of Shares, Outstanding at March 31, 2013 | shares 18,036
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2012 $ 53.55
Weighted Average Grant Date Fair Value, Granted 57.57
Weighted Average Grant Date Fair Value, Vested 53.55
Weighted Average Grant Date Fair Value, Outstanding at March 31, 2013 $ 57.57
Weighted Average Life Remaining, Outstanding at March 31, 2013 (in years) 7 months 12 days
Range of settlement date for shares for non-employee trustee from grant date, minimum (in years) 1 year
Unamortized share-based compensation expense | $ $ 606