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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 12, 2016
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 | 257,606 | 285,986 | 516,305 |
Number of Shares, Exercised | (25,721) | (29,253) | (230,319) |
Number of Shares, Granted | 3,835 | 2,215 |  |
Number of Shares, Forfeited | (845) | (1,342) |  |
Number of Shares, Outstanding at End of Period | 234,875 | 257,606 | 285,986 |
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 | $ 51.81 | $ 51.93 | $ 48.42 |
Average Exercise Price, Exercised | 50.68 | 54.54 | 44.05 |
Average Exercise Price, Granted | 56.94 | 76.63 |  |
Average Exercise Price, Forfeited | 61.12 | 59.52 |  |
Average Exercise Price, Outstanding at End of Period | 51.98 | 51.81 | 51.93 |
Weighted average fair value of options granted | $ 3.03 | $ 7.91 | $ 0 |
Intrinsic value of stock options exercised | $ 400 | $ 500 | $ 5,200 |
Severance expense | $ 5,938 | $ 0 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Shares | 20,258 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Value | $ 1,400 |  |  |
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 | $ 19.02 | $ 19.02 | $ 19.02 |
Option Price Per Share, Exercised | 45.20 | 46.86 | 19.41 |
Option Price Per Share, Granted | 56.94 | 76.63 |  |
Option Price Per Share, Forfeited | 51.64 | 51.64 |  |
Option Price Per Share, Outstanding at End of Period | $ 19.02 | 19.02 | 19.02 |
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 | $ 76.63 | 61.79 | 65.50 |
Option Price Per Share, Exercised | 61.79 | 61.79 | 65.50 |
Option Price Per Share, Granted | 56.94 | 76.63 |  |
Option Price Per Share, Forfeited | 61.79 | 61.79 |  |
Option Price Per Share, Outstanding at End of Period | $ 76.63 | $ 76.63 | $ 61.79 |
2016 Equity Incentive Plan [Member] |  |  |  |
Common shares, options to purchase common shares and restricted share units, expected to granted |  |  |  | 1,950,000
Number of shares available for grant | 1,322,389 |  |  |
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 | $ 300 | $ 700 | $ 900 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum | 2.70% | 2.10% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 7.60% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  | 22.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 18.90% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate | 0.74% | 0.74% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 6 years | 6 years |  |
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% |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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