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Retirement Plans (Details 5) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Amounts Recognized in Balance Sheet [Abstract] |  |
Long-term defined benefit plan liabilities | $ (67,334) | $ (72,568)
U.S. Pension Plans |  |
Amounts Recognized in Balance Sheet [Abstract] |  |
Long-term defined benefit plan assets | 4,562 |
Current defined benefit plan liabilities | (76) | (1,343)
Long-term defined benefit plan liabilities | (1,177) | (13,408)
Net amount of defined benefit plan recognized in balance sheet | 3,309 | (14,751)
U.S. Retiree Healthcare Plan |  |
Amounts Recognized in Balance Sheet [Abstract] |  |
Current defined benefit plan liabilities | (347) | (289)
Long-term defined benefit plan liabilities | (5,649) | (5,490)
Net amount of defined benefit plan recognized in balance sheet | (5,996) | (5,779)
Non-U.S. Pension Plans |  |
Amounts Recognized in Balance Sheet [Abstract] |  |
Long-term defined benefit plan assets | 1,245 | 1,084
Long-term defined benefit plan liabilities | (22,633) | (20,847)
Net amount of defined benefit plan recognized in balance sheet | $ (21,388) | $ (19,763)

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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + 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 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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