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Retirement Plans (Details 7) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
U.S. Pension Plans
Accumulated Other Comprehensive Income [Abstract]
Net actuarial (loss) gain on defined benefit plan recognized in accumulated other comprehensive loss	$ (37,682)	$ (49,486)
Total recognized in accumulated other comprehensive loss	(37,682)	(49,486)
Amounts that will be Amortized from Accumulated Other Comprehensive Income in Next Fiscal Year [Abstract]
Net actuarial loss on defined benefit plan to be amortized from accumulated other comprehensive loss in the next fiscal year	(3,075)
Defined benefit plan amounts that will be amortized from accumulated other comprehensive loss in the next fiscal year	(3,075)
U.S. Retiree Healthcare Plan
Accumulated Other Comprehensive Income [Abstract]
Net actuarial (loss) gain on defined benefit plan recognized in accumulated other comprehensive loss	588	575
Total recognized in accumulated other comprehensive loss	588	575
Non-U.S. Pension Plans
Accumulated Other Comprehensive Income [Abstract]
Net actuarial (loss) gain on defined benefit plan recognized in accumulated other comprehensive loss	(18,857)	(19,638)
Prior service credit from defined benefit plan recognized in accumulated other comprehensive loss	530	1,348
Total recognized in accumulated other comprehensive loss	(18,327)	$ (18,290)
Amounts that will be Amortized from Accumulated Other Comprehensive Income in Next Fiscal Year [Abstract]
Net actuarial loss on defined benefit plan to be amortized from accumulated other comprehensive loss in the next fiscal year	(685)
Prior service credit from defined benefit plan to be amortized from accumulated other comprehensive loss in the next fiscal year	119
Defined benefit plan amounts that will be amortized from accumulated other comprehensive loss in the next fiscal year	$ (566)

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ 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 (j)
-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
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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Paragraph 1
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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

+ References

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