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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable Rate

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Price Per Share

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-employee Trustee Length of Period Subsequent to Grant Date Options Not Exercisable

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Price Per Share

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 14.F)
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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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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.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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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).

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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.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

Net number of share options (or share units) granted during the period.

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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

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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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	May 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	5,742
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 52.42
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 1 month
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	228,820
Maximum term of options granted (in years)	10 years
Exercisable rate for employees options, per year	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at Beginning of Period	257,606
Number of Shares, Granted	3,835
Number of Shares, Outstanding at End of Period	255,494
Average Exercise Price, Outstanding at Beginning of Period	$ 51.87		$ 51.81
Average Exercise Price, Outstanding at End of Period	51.87		51.81
Weighted average fair value of options granted	$ 3.03	$ 7.91
Intrinsic value of stock options exercised	$ 100	$ 500
Share based compensation expenses recognized in future periods	$ 200
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 56.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	205
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 59.02
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share	51.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share	45.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Option Price Per Share, Outstanding at Beginning of Period	19.02		19.02
Option Price Per Share, Outstanding at End of Period	19.02		19.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Price Per Share	56.94
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share	61.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share	61.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Option Price Per Share, Outstanding at Beginning of Period	76.63		76.63
Option Price Per Share, Outstanding at End of Period	76.63		$ 76.63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Price Per Share	$ 56.94
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock-option expense	$ 147	$ 361
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	2.70%
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%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years
Share Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	7.60%
2016 Equity Incentive Plan [Member]
Common shares, options to purchase common shares and restricted share units, expected to granted (in shares)				1,950,000
Number of shares available for grant (in shares)	1,309,271
Exercise Price Range Nineteen Point Two to Nineteen Point Nine Nine [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	11,097
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	11,097
Thirty To Thirty Nine Point Nine Nine Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 year 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,428
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	1,428
Forty To Forty Nine Point Nine Nine Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	84,509
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	84,509
Fifty To Fifty Nine Point Nine Nine Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 8 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	72,639
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	76,474
Sixty To Sixty Five Point Five Zero Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	58,593
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	79,771
Seventy To Seventy Six Point Six Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	8 years 8 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	8 years 8 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	554
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	2,215