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Retirement Plans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Facility | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
2014 Restructuring plan [Member] |  |  |
Facilities closed associated with defined benefit plan [Abstract] |  |  |
Number of facilities closed associated with the defined benefit plan | Facility | 2 |  |
Defined Contribution Plan [Member] |  |  |
Defined Contribution Plans Disclosure [Abstract] |  |  |
Percentage of matching contributions under defined contribution plan | 4.00% |  |
Total expense for defined contribution plans | $ 6,000 | $ 6,700 | $ 5,400
Pension Plan [Member] |  |  |
Benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 41,691 | 46,359 |
Service cost | 1,939 | 2,091 | 2,692
Interest cost | 1,222 | 1,669 | 1,803
Foreign currency exchange rate changes | 1,607 | (2,306) |
Benefits paid | (9,633) | (8,280) |
Actuarial loss | 931 | 1,906 |
Other | 0 | 252 |
Benefit obligation at end of year | 37,757 | 41,691 | 46,359
Change in fair value of plan assets [Roll Forward] |  |  |
Plan assets at beginning of year | 36,141 | 36,236 |
Company contributions | 1,195 | 6,947 |
Foreign currency exchange rate changes | 2,318 | (3,714) |
Benefits paid | (9,633) | (8,280) |
Actual gain on plan assets | 1,747 | 4,952 |
Plan assets at end of year | 31,768 | 36,141 | 36,236
Funded status | (5,989) | (5,550) |
Accumulated benefit obligation | 36,951 | 40,743 |
Amounts recognized in Consolidated Balance Sheets [Abstract] |  |  |
Accrued employee and retiree benefits | (13,304) | (14,510) |
Other accrued expenses | (2,731) | (765) |
Other assets | 10,046 | 9,725 |
Net liability | (5,989) | (5,550) |
Components of annual benefit cost [Abstract] |  |  |
Service cost | 1,939 | 2,091 | 2,692
Interest cost | 1,222 | 1,669 | 1,803
Expected return on plan assets | (892) | (1,141) | (1,210)
Recognized actuarial (gain) loss | (187) | 193 | 228
Settlement expense | 3,796 | 543 | 1,119
Curtailment gain | 0 | 0 | (104)
Defined benefit expense | $ 5,878 | $ 3,355 | 4,528
Weighted average liability assumptions [Abstract] |  |  |
Discount rate | 3.16% | 3.48% |
Expected return on plan assets | 3.03% | 2.85% |
Rate of compensation increase | 0.33% | 0.43% |
Weighted average cost assumption [Abstract] |  |  |
Discount rate | 3.48% | 3.94% |
Expected return on plan assets | 2.85% | 3.40% |
Rate of compensation increase | 0.43% | 0.35% |
Estimated Future Benefit Payments [Abstract] |  |  |
2018 | $ 3,700 |  |
2019 | 1,700 |  |
2020 | 1,800 |  |
2021 | 1,800 |  |
2022 | 4,100 |  |
2023 through 2027 | 14,400 |  |
Estimated future employer contributions for next fiscal year | 3,000 |  |
Amounts recognized in Accumulated Other Comprehensive Income [Abstract] |  |  |
Unrecognized net actuarial loss | 1,112 | $ 3,384 |
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract] |  |  |
Net actuarial gain (loss) arising during the period | 921 | 1,312 | (140)
Amortization of actuarial loss, included in defined benefit expense | 1,307 | 544 | 917
Pension adjustment, net of tax | 2,228 | 1,856 | $ 777
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract] |  |  |
Expected amortization of actuarial loss in next fiscal year | (100) |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 31,768 | 36,141 |
Pension Plan [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 7,204 | 6,832 |
Pension Plan [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 24,564 | 29,309 |
Pension Plan [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Pension Plan [Member] | Domestic [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 6,226 | 5,830 |
Pension Plan [Member] | Domestic [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 6,226 | 5,830 |
Pension Plan [Member] | Domestic [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Pension Plan [Member] | Domestic [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Pension Plan [Member] | International [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 101 | 254 |
Pension Plan [Member] | International [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 106 |
Pension Plan [Member] | International [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 101 | 148 |
Pension Plan [Member] | International [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Pension Plan [Member] | International Fixed Income Funds [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 25,340 | 23,156 |
Pension Plan [Member] | International Fixed Income Funds [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 934 | 851 |
Pension Plan [Member] | International Fixed Income Funds [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 24,406 | 22,305 |
Pension Plan [Member] | International Fixed Income Funds [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Pension Plan [Member] | Other Investments [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 101 | 6,901 |
Pension Plan [Member] | Other Investments [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 44 | 45 |
Pension Plan [Member] | Other Investments [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 57 | 6,856 |
Pension Plan [Member] | Other Investments [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | $ 0 | $ 0 |

X
- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition 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 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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