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Equity Incentive Plans (Summary Of Share Option Activity) (Details) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2010
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2010
Maximum [Member]
Dec. 31, 2012
2007 Equity Incentive Plan [Member]
May 09, 2007
2007 Equity Incentive Plan [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2010
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Minimum [Member]
Dec. 31, 2010
Stock Options [Member]
Minimum [Member]
Dec. 31, 2012
Stock Options [Member]
Maximum [Member]
Dec. 31, 2010
Stock Options [Member]
Maximum [Member]
Common shares, options to purchase common shares and restricted share units, expected to granted                     1,950,000              
Number of shares available for grant                   411,862                
Maximum term of options granted, years 10 years                                  
Exercisable rate for employees options, per year 25.00%                                  
Share based compensation, future vesting period minimum (in years) 4 years     3 years     4 years         4 years            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                                    
Number of Shares, Outstanding at Beginning of Period 1,002,833 1,071,096 1,208,288                              
Number of Shares, Exercised (224,181) (135,196) (168,743)                              
Number of Shares, Granted 103,082 70,266 39,438                              
Number of Shares, Forfeited (396) (3,333) (7,887)                              
Number of Shares, Outstanding at End of Period 881,338 1,002,833 1,071,096                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Option Price Per Share [Roll Forward]                                    
Option Price Per Share, Outstanding at Beginning of Period       $ 18.18 $ 16.05 $ 14.00 $ 65.50 $ 65.50 $ 65.50                  
Option Price Per Share, Exercised       $ 18.18 $ 18.18 $ 14.00 $ 36.56 $ 42.46 $ 42.46                  
Option Price Per Share, Granted       $ 44.62 $ 45.73 $ 36.56 $ 47.99 $ 47.77 $ 44.98                  
Option Price Per Share, Forfeited       $ 18.18 $ 16.05 $ 18.18 $ 46.69 $ 16.05 $ 60.03                  
Option Price Per Share, Outstanding at End of Period       $ 18.18 $ 18.18 $ 16.05 $ 65.50 $ 65.50 $ 65.50                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]                                    
Average Exercise Price, Outstanding at Beginning of Period $ 34.41 $ 32.00 $ 30.27                              
Average Exercise Price, Exercised $ 23.42 $ 21.96 $ 20.91                              
Average Exercise Price, Granted $ 45.60 $ 46.19 $ 38.23                              
Average Exercise Price, Forfeited $ 40.03 $ 16.05 $ 34.70                              
Average Exercise Price, Outstanding at End of Period $ 38.51 $ 34.41 $ 32.00                              
Weighted average fair value of options granted $ 12.08 $ 9.29 $ 7.27                              
Intrinsic value of stock options exercised $ 5,100,000 $ 2,900,000 $ 3,500,000                              
Stock or Unit Option Plan Expense                       $ 937,000 $ 777,000 $ 674,000        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum                       1.10% 2.50% 2.60%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum                       1.40% 3.10% 3.10%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                         6.40%   6.30% 6.50% 6.70% 6.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum                             51.30% 39.50%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum                                 51.40% 39.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                         39.80%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate 0.25% 0.00%                                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                       6 years 8 years          
option exercise period 1 year