Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Decrease in Net Periodic Pension Cost Due to Change in Method	$ 2,000		$ 4,000
Defined benefit plans:
Multiemployer pension plans	505	$ 741	1,026	$ 1,306
Defined contribution pension plans	2,476	2,817	5,302	6,265
U. S. Plans
Defined benefit plans:
Service cost	946	722	1,892	1,444
Interest cost	2,545	3,089	5,090	6,179
Expected return on plan assets	(3,601)	(4,203)	(7,202)	(8,406)
Recognized prior service costs	15	20	31	40
Recognized loss	1,372	1,230	2,744	2,459
Defined benefit plans net periodic pension cost	1,277	858	2,555	1,716
Defined benefit pension plan	470	592	940	1,274
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			1,100
International Plans
Defined benefit plans:
Service cost	405	453	809	892
Interest cost	6,984	9,140	14,107	18,329
Expected return on plan assets	(11,219)	(12,611)	(22,682)	(25,285)
Recognized prior service costs	45	48	89	97
Recognized loss	3,142	4,223	6,360	8,457
Defined benefit plans net periodic pension cost	(643)	1,253	(1,317)	2,490
Defined benefit pension plan	$ 3,254	$ 4,165	13,052	$ 20,231
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			$ 5,300

Decrease in Net Periodic Pension Cost Due to Change in Method

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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

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

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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.

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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 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.

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

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

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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.

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