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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 09, 2007
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 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number of Shares, Outstanding at Beginning of Period | 950,214 | 840,665 | 881,338 |
Number of Shares, Exercised | (476,400) | (35,963) | (143,272) |
Number of Shares, Granted | 121,546 | 172,178 | 115,257 |
Number of Shares, Forfeited | (79,055) | (26,666) | (12,658) |
Number of Shares, Outstanding at End of Period | 516,305 | 950,214 | 840,665 |
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 | $ 42.48 | $ 40.85 | $ 38.51 |
Average Exercise Price, Exercised | 37.42 | 42.63 | 30.64 |
Average Exercise Price, Granted | 61.79 | 51.64 | 47.86 |
Average Exercise Price, Forfeited | 63.88 | 50.11 | 56.90 |
Average Exercise Price, Outstanding at End of Period | 48.42 | 42.48 | 40.85 |
Weighted average fair value of options granted | $ 16.35 | $ 13.87 | $ 12.35 |
Intrinsic value of stock options exercised | $ 7,300 | $ 400 | $ 2,900 |
Retirement severance expense | $ 18,578 | $ 0 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Shares | 402,067 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Value | $ 21,200 |  |  |
Minimum [Member] |  |  |  |
Share based compensation, future vesting period minimum (in years) | 3 years |  |  |
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 | $ 18.18 | $ 18.18 |
Option Price Per Share, Exercised | 18.18 | 32.50 | 18.18 |
Option Price Per Share, Granted | 61.79 | 51.64 | 46.86 |
Option Price Per Share, Forfeited | 45.20 | 45.20 | 36.56 |
Option Price Per Share, Outstanding at End of Period | $ 19.02 | 18.18 | 18.18 |
Maximum [Member] |  |  |  |
Share based compensation, future vesting period minimum (in years) | 4 years |  |  |
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 | $ 65.50 | 65.50 | 65.50 |
Option Price Per Share, Exercised | 61.53 | 52.72 | 47.20 |
Option Price Per Share, Granted | 61.79 | 51.64 | 58.09 |
Option Price Per Share, Forfeited | 65.50 | 51.64 | 60.42 |
Option Price Per Share, Outstanding at End of Period | $ 65.50 | $ 65.50 | $ 65.50 |
2007 Equity Incentive Plan [Member] |  |  |  |
Common shares, options to purchase common shares and restricted share units, expected to granted |  |  |  | 3,650,000
Number of shares available for grant | 1,066,138 |  |  |
Stock Options [Member] |  |  |  |
Share based compensation, future vesting period minimum (in years) | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Stock or Unit Option Plan Expense | $ 1,119 | $ 1,400 | $ 856 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum | 1.90% | 2.20% | 1.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 5.90% | 6.40% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  |  | 50.70% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 48.00% | 50.30% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate | 0.78% | 0.28% | 0.23% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 6 years | 6 years | 6 years |
stock option expense including severance costs | $ 2,500 |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  | 5.40% |
Stock Options [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  | 6.50% |
Chief Executive Officer [Member] | Employee Severance [Member] | Accelerated Vesting of Shares [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Retirement severance expense | $ 1,400 |  |  |

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