Employee Benefits Plans (Details 5) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of pension obligations greater than fair value of related plan assets
Total accumulated benefit obligations	$ 2,202,472	$ 2,064,399
Plans with pension obligations in excess of plan assets:
PBO	1,779,351	1,679,865
ABO	1,754,168	1,647,637
Fair value of plan assets	1,323,751	1,191,182
U.S.
Summary of pension obligations greater than fair value of related plan assets
Total accumulated benefit obligations	1,748,171	1,640,844
Plans with pension obligations in excess of plan assets:
PBO	1,771,968	1,671,949
ABO	1,748,171	1,640,844
Fair value of plan assets	1,323,751	1,191,182
Foreign
Summary of pension obligations greater than fair value of related plan assets
Total accumulated benefit obligations	454,301	423,555
Plans with pension obligations in excess of plan assets:
PBO	7,383	7,916
ABO	5,997	6,793
Fair value of plan assets	$ 0	$ 0

Schedule of pension obligations in excess of fair value of plan assets.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- References

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- Definition

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

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- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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-Paragraph 3
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