Share Options And Awards (Share Options Outstanding And Exercisable) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Option Outstanding, Number	4,085,702
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 11 months
Share Option Outstanding, Weighted Average Exercise Price	$ 28.98
Share Option Outstanding, Aggregate Intrinsic Value	$ 0
Share Option Exercisable, Number	3,061,607
Share Option Exercisable, Weighted Average Exercise Price	$ 31.42
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	4 years 2 months
Share Option Exercisable, Aggregate Intrinsic Value	$ 0
$11.85 - $17.78 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 11.85
Range of Exercise Prices, Upper	$ 17.78
Share Option Outstanding, Number	809,936
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 2 months
Share Option Outstanding, Weighted Average Exercise Price	$ 11.85
Share Option Exercisable, Number	528,039
Share Option Exercisable, Weighted Average Exercise Price	$ 11.85
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	6 years 2 months
$17.79 - $26.69 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 17.79
Range of Exercise Prices, Upper	$ 26.69
Share Option Outstanding, Number	921,177
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	7 years 10 months
Share Option Outstanding, Weighted Average Exercise Price	$ 23.76
Share Option Exercisable, Number	307,792
Share Option Exercisable, Weighted Average Exercise Price	$ 23.40
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	7 years 8 months
$26.70 - $40.05 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 26.70
Range of Exercise Prices, Upper	$ 40.05
Share Option Outstanding, Number	1,883,893
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 2 months
Share Option Outstanding, Weighted Average Exercise Price	$ 34.27
Share Option Exercisable, Number	1,755,080
Share Option Exercisable, Weighted Average Exercise Price	$ 34.42
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	3 years 1 month
$40.06 - $49.62 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower	$ 40.06
Range of Exercise Prices, Upper	$ 49.62
Share Option Outstanding, Number	470,696
Share Option Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 11 months
Share Option Outstanding, Weighted Average Exercise Price	$ 47.46
Share Option Exercisable, Number	470,696
Share Option Exercisable, Weighted Average Exercise Price	$ 47.46
Share Option Exercisable, Weighted Average Remaining Contractual Life (years)	3 years 11 months

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

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options 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

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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

+ Details

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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

+ Details

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- Definition

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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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=6415400&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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

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

+ Details

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- Definition

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

+ Details

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- Definition

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.

+ References

+ Details

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