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Retirement Benefit Plans Part 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Plans with accumulated benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | $ 2,427 | $ 12,597 |
Fair value of plan assets | 0 | 9,562 |
Plans with projected benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 2,427 | 12,794 |
Fair value of plan assets | 0 | 9,562 |
Changes in Accumulated Other Comprehensive Loss: |  |  |
Total recognized in other comprehensive loss (income) | $ (5,868) | $ 2,248 | $ (4,121)
Other Postretirement Benefits Plan |  |  |
Assumed healthcare cost trend rates |  |  |
Healthcare cost trend rate assumption for the next year | 6.56% | 6.56% |
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.00% | 5.00% |
Year that the rate reaches the ultimate trend rate | 2032 | 2031 |
Effect of one-percentage-point change in assumed healthcare cost trends |  |  |
Effect of one-percentage-point decrease on total of service and interest cost components | $ (31) |  |
Effect of one-percentage-point increase on total of service and interest cost components | 35 |  |
Effect of one-percentage-point decrease on postretirement benefit obligation | (724) |  |
Effect of one-percentage-point increase on postretirement benefit obligation | 820 |  |
Pension Plan |  |  |
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year |  |  |
Net actuarial loss | $ 78 |  |
Postretirement Medical Benefits |  |  |
Weighted-average assumptions used to determine benefit obligation |  |  |
Discount rate | 3.26% | 3.58% |
Rate of compensation increase | 0.00% | 0.00% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 3.58% | 3.70% | 3.39%
Expected long-term rate of return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 10,540 | $ 11,144 |
Service cost | 60 | 76 | $ 96
Interest cost | 363 | 396 | 393
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | (524) | 6 |
Foreign exchange | 0 | 0 |
Benefits paid | (835) | (1,082) |
Settlement | 0 | 0 |
Benefit obligation at end of year | 9,604 | 10,540 | 11,144
Change in fair value of plan assets and net accrued liabilities: |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 835 | 1,082 |
Plan participants' contributions | 0 | 0 |
Excess assets transferred to Defined Contribution Plan | 0 | 0 |
Foreign exchange | 0 | 0 |
Benefits paid | (835) | (1,082) |
Settlement | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status at end of year | (9,604) | (10,540) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent Other Assets | 0 | 0 |
Current Liabilities | (771) | (828) |
Long-Term Liabilities | (8,833) | (9,712) |
Net accrued asset (liability) | (9,604) | (10,540) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | (41) | (566) |
Accumulated Other Comprehensive Loss | (41) | (566) |
Components of the net periodic benefit (credit) cost |  |  |
Service cost | 60 | 76 | 96
Interest cost | 363 | 396 | 393
Expected return on plan assets | 0 | 0 | 0
Amortization of net actuarial loss | 0 | 0 | 0
Amortization of prior service cost (credit) | 0 | 0 | 0
Foreign currency | 0 | 0 | 0
Net periodic benefit (credit) cost | 423 | 472 | 489
Curtailment charge | 0 | 0 | 0
Settlement credit | 0 | 0 | 0
Net periodic benefit (credit) cost | 423 | 472 | 489
Changes in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | (524) | 6 | (1,618)
Amortization of prior service (cost) credit | 0 | 0 | 0
Amortization of net actuarial loss | 0 | 0 | 0
Settlement Charge | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | (524) | 6 | (1,618)
Total recognized in net periodic cost and other comprehensive loss (income) | (101) | $ 478 | $ (1,129)
Expected future benefit payments |  |  |
2018 | 771 |  |
2019 | 803 |  |
2020 | 849 |  |
2021 | 751 |  |
2022 | 741 |  |
2023 to 2027 | 3,509 |  |
Total | 7,424 |  |
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year |  |  |
Net actuarial loss | 0 |  |
Domestic Plan | Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | $ 0 |  |
Weighted-average assumptions used to determine benefit obligation |  |  |
Discount rate | 3.28% | 3.92% |
Rate of compensation increase | 0.00% | 3.00% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 3.92% | 4.08% | 3.76%
Expected long-term rate of return on plan assets | 5.10% | 5.20% | 5.20%
Rate of compensation increase | 0.00% | 3.00% | 3.00%
Accumulated benefit obligations |  |  |
Accumulated benefit obligations | $ 1,414 | $ 40,961 |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 40,961 | 41,774 |
Service cost | 0 | 354 | $ 480
Interest cost | 1,538 | 1,659 | 1,711
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | 1,811 | 690 |
Foreign exchange | 0 | 0 |
Benefits paid | (1,950) | (3,516) |
Settlement | (40,946) | 0 |
Benefit obligation at end of year | 1,414 | 40,961 | 41,774
Change in fair value of plan assets and net accrued liabilities: |  |  |
Fair value of plan assets at beginning of year | 46,389 | 47,201 |
Actual return on plan assets | 2,536 | 2,457 |
Employer contributions | 276 | 247 |
Plan participants' contributions | 0 | 0 |
Excess assets transferred to Defined Contribution Plan | (6,305) | 0 |
Foreign exchange | 0 | 0 |
Benefits paid | (1,950) | (3,516) |
Settlement | (40,946) | 0 |
Fair value of plan assets at end of year | 0 | 46,389 | 47,201
Funded status at end of year | (1,414) | 5,428 |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent Other Assets | 0 | 7,087 |
Current Liabilities | (140) | (239) |
Long-Term Liabilities | (1,274) | (1,420) |
Net accrued asset (liability) | (1,414) | 5,428 |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | (915) | (5,720) |
Accumulated Other Comprehensive Loss | (915) | (5,720) |
Components of the net periodic benefit (credit) cost |  |  |
Service cost | 0 | 354 | 480
Interest cost | 1,538 | 1,659 | 1,711
Expected return on plan assets | (2,336) | (2,400) | (2,613)
Amortization of net actuarial loss | 43 | 41 | 835
Amortization of prior service cost (credit) | 0 | 41 | 42
Foreign currency | 0 | 0 | 0
Net periodic benefit (credit) cost | (755) | (305) | 455
Curtailment charge | 0 | 0 | 25
Settlement credit | 6,373 | 0 | 225
Net periodic benefit (credit) cost | 5,618 | (305) | 705
Changes in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | 1,611 | 633 | 195
Amortization of prior service (cost) credit | 0 | (41) | (67)
Amortization of net actuarial loss | (43) | (41) | (1,060)
Settlement Charge | (6,373) | 0 | 0
Total recognized in other comprehensive loss (income) | (4,805) | 551 | (932)
Total recognized in net periodic cost and other comprehensive loss (income) | 813 | $ 246 | $ (227)
Expected future benefit payments |  |  |
2018 | 140 |  |
2019 | 133 |  |
2020 | 132 |  |
2021 | 124 |  |
2022 | 117 |  |
2023 to 2027 | 493 |  |
Total | $ 1,139 |  |
Domestic Plan | Pension Plan | Debt Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Target allocation of investments | 70.00% |  |
Domestic Plan | Pension Plan | Equity Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Target allocation of investments | 30.00% |  |
Foreign Plan | Pension Plan |  |  |
Weighted-average assumptions used to determine benefit obligation |  |  |
Discount rate | 2.45% | 2.64% |
Rate of compensation increase | 3.50% | 3.50% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 2.64% | 3.59% | 3.38%
Expected long-term rate of return on plan assets | 3.90% | 4.60% | 4.40%
Rate of compensation increase | 3.50% | 3.50% | 3.50%
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 11,136 | $ 10,883 |
Service cost | 132 | 103 | $ 153
Interest cost | 298 | 358 | 396
Plan participants' contributions | 14 | 14 |
Actuarial loss (gain) | 327 | 1,939 |
Foreign exchange | (1,097) | 1,852 |
Benefits paid | (860) | (309) |
Settlement | 0 | 0 |
Benefit obligation at end of year | 12,144 | 11,136 | 10,883
Change in fair value of plan assets and net accrued liabilities: |  |  |
Fair value of plan assets at beginning of year | 9,562 | 10,691 |
Actual return on plan assets | 1,189 | 673 |
Employer contributions | 313 | 303 |
Plan participants' contributions | 14 | 14 |
Excess assets transferred to Defined Contribution Plan | 0 | 0 |
Foreign exchange | 945 | (1,810) |
Benefits paid | (860) | (309) |
Settlement | 0 | 0 |
Fair value of plan assets at end of year | 11,163 | 9,562 | 10,691
Funded status at end of year | (981) | (1,574) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent Other Assets | 0 | 0 |
Current Liabilities | (36) | (30) |
Long-Term Liabilities | (945) | (1,544) |
Net accrued asset (liability) | (981) | (1,574) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | (1,245) | (1,802) |
Accumulated Other Comprehensive Loss | (1,245) | (1,802) |
Components of the net periodic benefit (credit) cost |  |  |
Service cost | 132 | 103 | 153
Interest cost | 298 | 358 | 396
Expected return on plan assets | (379) | (452) | (433)
Amortization of net actuarial loss | 74 | 27 | 54
Amortization of prior service cost (credit) | 0 | 0 | 0
Foreign currency | (1) | 97 | (35)
Net periodic benefit (credit) cost | 124 | 133 | 135
Curtailment charge | 0 | 0 | 0
Settlement credit | 0 | 0 | 0
Net periodic benefit (credit) cost | 124 | 133 | 135
Changes in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | (465) | 1,718 | (1,517)
Amortization of prior service (cost) credit | 0 | 0 | 0
Amortization of net actuarial loss | (74) | (27) | (54)
Settlement Charge | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | (539) | 1,691 | (1,571)
Total recognized in net periodic cost and other comprehensive loss (income) | (415) | 1,824 | $ (1,436)
Expected future benefit payments |  |  |
2018 | 247 |  |
2019 | 254 |  |
2020 | 261 |  |
2021 | 269 |  |
2022 | 278 |  |
2023 to 2027 | 1,538 |  |
Total | 2,847 |  |
Nonqualified Plan | Domestic Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 140 |  |
German Pension Plan | Foreign Plan | Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 36 |  |
Accumulated benefit obligations |  |  |
Accumulated benefit obligations | 1,013 | 871 |
Retiree Plan | Domestic Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 771 |  |
U.K. Pension Plan | Foreign Plan | Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 292 |  |
Accumulated benefit obligations |  |  |
Accumulated benefit obligations | $ 11,131 | $ 10,265 |

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- Definition Ultimate trend rate for health care cost for defined benefit postretirement 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service 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 (i) -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 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: 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 + Details
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- Definition Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan. + 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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 + Details
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