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Retirement Plans (Details 4) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Funded Status of Plan [Abstract]
Fair value of defined benefit plan assets	$ 257,488	$ 219,355
U.S. Pension Plans
Funded Status of Plan [Abstract]
Projected benefit obligation	(168,064)	(159,416)	$ (155,003)
Fair value of defined benefit plan assets	171,373	144,665	136,128
Funded status of defined benefit plan	3,309	(14,751)
U.S. Retiree Healthcare Plan
Funded Status of Plan [Abstract]
Projected benefit obligation	(17,121)	(14,921)	(12,963)
Fair value of defined benefit plan assets	11,125	9,142	8,001
Funded status of defined benefit plan	(5,996)	(5,779)
Non-U.S. Pension Plans
Funded Status of Plan [Abstract]
Projected benefit obligation	(96,378)	(85,311)	(75,677)
Fair value of defined benefit plan assets	74,990	65,548	$ 60,441
Funded status of defined benefit plan	$ (21,388)	$ (19,763)

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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X

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

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- References

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- Details

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