Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Defined benefit plans:
Multiemployer pension plans	$ 485	$ 521
Defined contribution pension plans	2,560	2,826
U. S. Plans
Defined benefit plans:
Service cost	942	946
Interest cost	2,469	2,545
Expected return on plan assets	(3,552)	(3,601)
Recognized prior service costs	8	16
Recognized loss	1,425	1,372
Defined benefit pension plans net periodic pension cost (income)	1,292	1,278
Defined benefit pension plan	471	470
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	5,800
International Plans
Defined benefit plans:
Service cost	411	404
Interest cost	5,734	7,123
Expected return on plan assets	(10,424)	(11,463)
Recognized prior service costs	45	44
Recognized loss	4,042	3,218
Defined benefit pension plans net periodic pension cost (income)	(192)	(674)
Defined benefit pension plan	8,337	$ 9,798
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 8,400

The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-Publisher FASB
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- Definition

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

+ References

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6512171

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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.

+ References

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-Publisher FASB
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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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- References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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