Nonpension Postretirement Benefits (Change in Accumulated Benefit Obligation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Nonpension Postretirement Benefit Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	$ 63,823	$ 76,207
Service Cost	1,008	1,192	1,472
Interest cost	2,948	2,732	3,530
Plan participants' contributions	699	810
Actuarial (gain) loss	5,495	(11,239)
Exchange rate fluctuations	(219)	(188)
Benefits paid	(5,653)	(5,691)
Benefit obligation, end of year	68,101	63,823	76,207
Funded status and accrued benefit cost	(68,101)	(63,823)
U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	61,117	73,523
Service Cost	1,007	1,190	1,470
Interest cost	2,840	2,622	3,426
Plan participants' contributions	699	810
Actuarial (gain) loss	5,466	(11,477)
Exchange rate fluctuations	0	0
Benefits paid	(5,564)	(5,551)
Benefit obligation, end of year	65,565	61,117	73,523
Funded status and accrued benefit cost	(65,565)	(61,117)
Non-U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	2,706	2,684
Service Cost	1	2	2
Interest cost	108	110	104
Plan participants' contributions	0	0
Actuarial (gain) loss	29	238
Exchange rate fluctuations	(219)	(188)
Benefits paid	(89)	(140)
Benefit obligation, end of year	2,536	2,706	2,684
Funded status and accrued benefit cost	$ (2,536)	$ (2,706)

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.

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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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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-Glossary Projected Benefit Obligation

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-Glossary Accumulated Postretirement Benefit Obligation

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Postretirement Benefits

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

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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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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 funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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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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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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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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