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Retirement Plans (Details 6) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts Recognized in Other Comprehensive Income [Abstract] |  |  |
Total recognized in other comprehensive income (loss) | $ 11,780 | $ (3,520) | $ 4,634
U.S. Pension Plans |  |  |
Net Periodic Benefit Cost [Abstract] |  |  |
Service cost | 450 | 377 |
Interest cost | 6,829 | 6,931 | 6,128
Expected return on plan assets | (10,298) | (9,635) | (9,145)
Settlement loss | 155 |  |
Net amortization: Net actuarial loss | 2,770 | 2,702 | 3,278
Net periodic pension (benefit) cost | (94) | 375 | 261
Amounts Recognized in Other Comprehensive Income [Abstract] |  |  |
Net gain (loss) arising during the year | 8,879 | (3,352) | (6,365)
Amortization: Net loss recognized in net periodic pension cost | 2,925 | 2,702 | 3,278
Total recognized in other comprehensive income (loss) | 11,804 | (650) | (3,087)
U.S. Retiree Healthcare Plan |  |  |
Net Periodic Benefit Cost [Abstract] |  |  |
Service cost | 546 | 473 | 577
Interest cost | 618 | 557 | 470
Expected return on plan assets | (587) | (519) | (497)
Net periodic pension (benefit) cost | 577 | 511 | 550
Amounts Recognized in Other Comprehensive Income [Abstract] |  |  |
Net gain (loss) arising during the year | 13 | (594) | 1,126
Total recognized in other comprehensive income (loss) | 13 | (594) | 1,126
Non-U.S. Pension Plans |  |  |
Net Periodic Benefit Cost [Abstract] |  |  |
Service cost | 5,082 | 4,954 | 5,087
Interest cost | 1,518 | 1,699 | 1,503
Expected return on plan assets | (1,688) | (1,596) | (1,542)
Settlement loss | 232 |  | 95
Net amortization: Prior service (credit) cost | (168) | (192) | 39
Net amortization: Net actuarial loss | 959 | 753 | 1,031
Net periodic pension (benefit) cost | 5,935 | 5,618 | 6,213
Amounts Recognized in Other Comprehensive Income [Abstract] |  |  |
Prior service credit (cost) | (636) |  | 645
Net gain (loss) arising during the year | 1,609 | (3,361) | 3,025
Amortization: Prior service (credit) cost recognized in net periodic pension cost | (168) | (192) | 39
Amortization: Net loss recognized in net periodic pension cost | 1,191 | 753 | 1,126
Other plans' impact on other comprehensive income (loss) |  | (360) |
Foreign currency impact on defined benefit plan amounts recognized in other comprehensive income (loss) | (2,033) | 884 | 1,760
Total recognized in other comprehensive income (loss) | $ (37) | $ (2,276) | $ 6,595

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of 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 (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + 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 (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed 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 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 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) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in other comprehensive income attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency. + References No definition available. + Details
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