Share Options And Awards (Share Options Outstanding And Exercisable) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share option outstanding, number (in shares) \| shares	828,354.000
Share option outstanding, weighted average remaining contractual life (years)	1 year 11 months
Share option outstanding, weighted average exercise price (in dollars per share)	$ 23.58
Share option outstanding, aggregate intrinsic value \| $	$ 7,695
Share option exercisable, number (in shares) \| shares	828,354.000
Share option exercisable, weighted average exercisable average life (years)	1 year 11 months
Share option exercisable, weighted average exercise price (in dollars per share)	$ 23.58
Share option exercisable, intrinsic value \| $	$ 7,695
$11.85 - $17.78 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower (in dollars per share)	$ 11.85
Range of exercise prices, upper (in dollars per share)	$ 17.78
Share option outstanding, number (in shares) \| shares	166,981
Share option outstanding, weighted average remaining contractual life (years)	1 year 2 months
Share option outstanding, weighted average exercise price (in dollars per share)	$ 11.85
Share option exercisable, number (in shares) \| shares	166,981
Share option exercisable, weighted average exercisable average life (years)	1 year 2 months
Share option exercisable, weighted average exercise price (in dollars per share)	$ 11.85
$17.79 - $26.69 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower (in dollars per share)	17.79
Range of exercise prices, upper (in dollars per share)	$ 26.69
Share option outstanding, number (in shares) \| shares	465,214
Share option outstanding, weighted average remaining contractual life (years)	2 years 11 months
Share option outstanding, weighted average exercise price (in dollars per share)	$ 24.14
Share option exercisable, number (in shares) \| shares	465,214
Share option exercisable, weighted average exercisable average life (years)	2 years 11 months
Share option exercisable, weighted average exercise price (in dollars per share)	$ 24.14
$26.70 - $40.05 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower (in dollars per share)	26.7
Range of exercise prices, upper (in dollars per share)	$ 40.05
Share option outstanding, number (in shares) \| shares	196,159
Share option outstanding, weighted average remaining contractual life (years)	2 months
Share option outstanding, weighted average exercise price (in dollars per share)	$ 32.22
Share option exercisable, number (in shares) \| shares	196,159
Share option exercisable, weighted average exercisable average life (years)	2 months
Share option exercisable, weighted average exercise price (in dollars per share)	$ 32.22

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, 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 (e)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average remaining contractual term of outstanding stock options, 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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