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Pension Plans and Other Postretirement Benefits Components of Pension and Postretirement Benefits Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actuarial (gain) loss | $ (11,400) | $ 26,700 |  |  |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  |  | $ 121 | $ 115 | $ 137
Interest cost |  |  | 2,340 | 2,483 | 2,573
Expected return on assets |  |  | (110) | (187) | (263)
Actuarial (gain) loss |  |  | 2,014 | 1,275 | (5,707)
Amortization of prior service benefit |  |  | (95) | (95) | (95)
Total net pension benefits cost (credit) |  |  | $ 4,270 | $ 3,591 | $ (3,355)
Weighted-average assumption percentages: |  |  |  |  |
Discount rate |  |  | 4.35% | 4.59% | 4.15%
Expected return on plan assets |  |  | 7.00% | 7.00% | 7.00%
Rate of compensation increase |  |  | 3.50% | 3.50% | 3.50%
Net pension or postretirement benefits credit |  |  |  |  | $ 2,600
Pension Plans |  |  |  |  |
Weighted-average assumption percentages: |  |  |  |  |
Net pension or postretirement benefits credit |  |  |  | $ 10,800 | 6,200
U.S. Plans | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  |  | $ 985 | 1,028 | 1,233
Interest cost |  |  | 28,614 | 30,514 | 30,235
Expected return on assets |  |  | (36,243) | (36,445) | (40,495)
Actuarial (gain) loss |  |  | (13,910) | 5,988 | 2,665
Amortization of prior service benefit |  |  | 75 | 75 | 75
Total net pension benefits cost (credit) |  |  | $ (20,479) | $ 1,160 | $ (6,287)
Weighted-average assumption percentages: |  |  |  |  |
Discount rate |  |  | 4.43% | 4.67% | 4.19%
Expected return on plan assets |  |  | 6.89% | 6.89% | 6.88%
Rate of compensation increase |  |  | 0.00% | 0.00% | 0.00%
Foreign Plans | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  |  | $ 2,547 | $ 3,133 | $ 3,909
Interest cost |  |  | 5,128 | 6,570 | 6,405
Expected return on assets |  |  | (4,441) | (4,027) | (3,670)
Actuarial (gain) loss |  |  | 483 | 19,418 | (27,043)
Amortization of prior service benefit |  |  | 56 | 859 | 43
Total net pension benefits cost (credit) |  |  | $ 3,773 | $ 25,953 | $ (20,356)
Weighted-average assumption percentages: |  |  |  |  |
Discount rate |  |  | 2.00% | 2.76% | 2.22%
Expected return on plan assets |  |  | 6.16% | 6.66% | 5.76%
Rate of compensation increase |  |  | 3.18% | 3.16% | 3.15%

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- Definition Mark-to-market adjustments for the gain or losses occurring on pension or postretirement plans during the year, and any mark-to-market true-up or other adjustments. + References No definition available. + Details
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- Definition Disposal Group, Including Discontinued Operation, Net Pension and Postretirement Benefits Cost (Credit) + References No definition available. + 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 Weighted average rate for present value of future retirement benefits cash flows, 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)(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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