Retirement Plans and Postretirement Medical Benefits (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Eligibility age for retiree medical benefits	55 years
Percent of all foreign plan assets	75.00%
Fair value of plan assets	$ 477,000	$ 410,000
Expected return on plan assets	6.25%	6.50%
Assumed health care cost trend rate	7.00%	6.00%
Next year's assumed health care cost trend rate	7.00%
Assumed health care cost trend rate decline	5.00%
Total contributions to defined contribution plans	$ 31,000	$ 32,000
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	188,841	189,772	$ 211,878
United States
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	$ 8,000
Nominal rate of return	7.00%
Fair value of plan assets	$ 1,557,069	$ 1,463,350
Expected return on plan assets	6.75%	7.00%	7.00%
United States \| Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 172,000	$ 174,000
Foreign
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	$ 11,000
Nominal rate of return	6.25%
Fair value of plan assets	$ 476,825	$ 425,962

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Eligibility Age for Retiree Medical Benefits

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Percent of All Foreign Plan Assets

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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-Publisher FASB
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-Section 50
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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 contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of cost for defined contribution plan.

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