Pension Arrangements (Change In Benefit Obligation, Change In Fair Value Of Plan Assets, Funded Status And Amounts Recognized In Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 360,185	$ 318,155
Service cost	4,499us-gaap_DefinedBenefitPlanServiceCost	3,682us-gaap_DefinedBenefitPlanServiceCost	3,662us-gaap_DefinedBenefitPlanServiceCost
Interest cost	15,633us-gaap_DefinedBenefitPlanInterestCost	13,359us-gaap_DefinedBenefitPlanInterestCost	13,143us-gaap_DefinedBenefitPlanInterestCost
Contributions by plan participants	1,164	1,251
Actuarial loss (gain)	33,568	23,410
Benefits paid	(11,128)us-gaap_DefinedBenefitPlanBenefitsPaid	(8,168)us-gaap_DefinedBenefitPlanBenefitsPaid
Foreign currency exchange rate changes	(21,986)	8,496
Benefit obligation at end of year	381,935	360,185	318,155
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	397,469	336,189
Actual return on plan assets	44,343	38,097
Employer contributions	2,740	20,268
Contributions by plan participants	1,164	1,251
Benefits paid	(11,128)us-gaap_DefinedBenefitPlanBenefitsPaid	(8,168)us-gaap_DefinedBenefitPlanBenefitsPaid
Foreign currency exchange rate changes	(23,660)	9,832
Fair value of plan assets at end of year	410,928	397,469	336,189
Net pension asset recognized	$ 28,993	$ 37,284

Pension Arrangements (Change In Benefit Obligation, Change In Fair Value Of Plan Assets, Funded Status And Amounts Recognized In Consolidated Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

Benefit obligation at beginning of year

$ 360,185us-gaap_DefinedBenefitPlanBenefitObligation

$ 318,155us-gaap_DefinedBenefitPlanBenefitObligation

Service cost

4,499us-gaap_DefinedBenefitPlanServiceCost

3,682us-gaap_DefinedBenefitPlanServiceCost

3,662us-gaap_DefinedBenefitPlanServiceCost

Interest cost

15,633us-gaap_DefinedBenefitPlanInterestCost

13,359us-gaap_DefinedBenefitPlanInterestCost

13,143us-gaap_DefinedBenefitPlanInterestCost

Contributions by plan participants

1,164us-gaap_DefinedBenefitPlanContributionsByPlanParticipants

1,251us-gaap_DefinedBenefitPlanContributionsByPlanParticipants

Actuarial loss (gain)

33,568us-gaap_DefinedBenefitPlanActuarialGainLoss

23,410us-gaap_DefinedBenefitPlanActuarialGainLoss

Benefits paid

(11,128)us-gaap_DefinedBenefitPlanBenefitsPaid

(8,168)us-gaap_DefinedBenefitPlanBenefitsPaid

Foreign currency exchange rate changes

(21,986)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation

8,496us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation

Benefit obligation at end of year

381,935us-gaap_DefinedBenefitPlanBenefitObligation

360,185us-gaap_DefinedBenefitPlanBenefitObligation

318,155us-gaap_DefinedBenefitPlanBenefitObligation

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

Fair value of plan assets at beginning of year

397,469us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

336,189us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

Actual return on plan assets

44,343us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets

38,097us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets

Employer contributions

2,740us-gaap_DefinedBenefitPlanContributionsByEmployer

20,268us-gaap_DefinedBenefitPlanContributionsByEmployer

Contributions by plan participants

1,164us-gaap_DefinedBenefitPlanContributionsByPlanParticipants

1,251us-gaap_DefinedBenefitPlanContributionsByPlanParticipants

Benefits paid

(11,128)us-gaap_DefinedBenefitPlanBenefitsPaid

(8,168)us-gaap_DefinedBenefitPlanBenefitsPaid

Foreign currency exchange rate changes

(23,660)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets

9,832us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets

Fair value of plan assets at end of year

410,928us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

397,469us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

336,189us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

Net pension asset recognized

$ 28,993us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet

$ 37,284us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet

- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

-URI http://asc.fasb.org/extlink&oid=6504192

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(1)

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Gain or Loss

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- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Postretirement Benefits

-URI http://asc.fasb.org/extlink&oid=6521376

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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- Definition

Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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