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Retirement Plans (Details 7) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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) |

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- Definition 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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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