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Retirement Benefit Plans Part 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | $ 2,217 |  |
Plans with accumulated benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | 2,217 | $ 2,427 |
Fair value of plan assets | 0 | 0 |
Changes in Accumulated Other Comprehensive Loss: |  |  |
Total recognized in other comprehensive loss (income) | $ (1,745) | (5,868) | $ 2,248
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | $ 2,427 |
Other Postretirement Benefits Plan |  |  |
Assumed healthcare cost trend rates |  |  |
Healthcare cost trend rate assumption for the next year | 6.38% | 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 | 2032 |
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 | $ (26) |  |
Effect of one-percentage-point increase on total of service and interest cost components | 29 |  |
Effect of one-percentage-point decrease on postretirement benefit obligation | (599) |  |
Effect of one-percentage-point increase on postretirement benefit obligation | 672 |  |
Pension Plan |  |  |
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year |  |  |
Net actuarial loss | 104 |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Transition Asset (Obligation), before Tax | $ 4 |  |
Postretirement Medical Benefits |  |  |
Weighted-average assumptions used to determine benefit obligation |  |  |
Discount rate | 3.95% | 3.26% |
Rate of compensation increase | 0.00% | 0.00% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 3.26% | 3.58% | 3.70%
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 | $ 9,604 | $ 10,540 |
Service cost | 45 | 60 | $ 76
Interest cost | 293 | 363 | 396
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | (485) | (524) |
Foreign exchange | 0 | 0 |
Benefits paid | (844) | (835) |
Settlement | 0 | 0 |
Change in fair value of plan assets and net accrued liabilities: |  |  |
Benefit obligation at end of year | 8,613 | 9,604 | 10,540
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 844 | 835 |
Plan participants' contributions | 0 | 0 |
Excess assets transferred to Defined Contribution Plan | 0 | 0 |
Foreign exchange | 0 | 0 |
Benefits paid | (844) | (835) |
Settlement | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status at end of year | (8,613) | (9,604) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent Other Assets | 0 | 0 |
Current Liabilities | (779) | (771) |
Long-Term Liabilities | (7,834) | (8,833) |
Net accrued asset (liability) | (8,613) | (9,604) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | 444 | (41) |
Accumulated Other Comprehensive Loss | 444 | (41) |
Components of the net periodic benefit (credit) cost |  |  |
Service cost | 45 | 60 | 76
Interest cost | 293 | 363 | 396
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 cost (credit) | 338 | 423 | 472
Curtailment charge | 0 | 0 | 0
Settlement credit | 0 | 0 | 0
Net periodic benefit (credit) cost | 338 | 423 | 472
Changes in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | (485) | (524) | 6
Amortization of prior service (cost) credit | 0 | 0 | 0
Amortization of net actuarial loss | 0 | 0 | 0
Settlement | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | (485) | (524) | 6
Total recognized in net periodic cost and other comprehensive loss (income) | (147) | $ (101) | $ 478
Expected future benefit payments |  |  |
2019 | 779 |  |
2020 | 830 |  |
2021 | 752 |  |
2022 | 755 |  |
2023 | 715 |  |
2024 to 2028 | 3,424 |  |
Total | 7,255 |  |
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year |  |  |
Net actuarial loss | $ 0 |  |
Domestic Plan | Pension Plan |  |  |
Weighted-average assumptions used to determine benefit obligation |  |  |
Discount rate | 3.95% | 3.28% |
Rate of compensation increase | 0.00% | 0.00% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 3.28% | 3.92% | 4.08%
Expected long-term rate of return on plan assets | 0.00% | 5.10% | 5.20%
Rate of compensation increase | 0.00% | 0.00% | 3.00%
Accumulated benefit obligations |  |  |
Accumulated benefit obligations | $ 1,267 | $ 1,414 |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 1,414 | 40,961 |
Service cost | 0 | 0 | $ 354
Interest cost | 43 | 1,538 | 1,659
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | 35 | 1,811 |
Foreign exchange | 0 | 0 |
Benefits paid | (149) | (1,950) |
Settlement | (76) | (40,946) |
Change in fair value of plan assets and net accrued liabilities: |  |  |
Benefit obligation at end of year | 1,267 | 1,414 | 40,961
Fair value of plan assets at beginning of year | 0 | 46,389 |
Actual return on plan assets | 0 | 2,536 |
Employer contributions | 225 | 276 |
Plan participants' contributions | 0 | 0 |
Excess assets transferred to Defined Contribution Plan | 0 | (6,305) |
Foreign exchange | 0 | 0 |
Benefits paid | (149) | (1,950) |
Settlement | (76) | (40,946) |
Fair value of plan assets at end of year | 0 | 0 | 46,389
Funded status at end of year | (1,267) | (1,414) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent Other Assets | 0 | 0 |
Current Liabilities | (146) | (140) |
Long-Term Liabilities | (1,121) | (1,274) |
Net accrued asset (liability) | (1,267) | (1,414) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | (852) | (915) |
Accumulated Other Comprehensive Loss | (852) | (915) |
Components of the net periodic benefit (credit) cost |  |  |
Service cost | 0 | 0 | 354
Interest cost | 43 | 1,538 | 1,659
Expected return on plan assets | 0 | (2,336) | (2,400)
Amortization of net actuarial loss | 49 | 43 | 41
Amortization of prior service cost (credit) | 0 | 0 | 41
Foreign currency | 0 | 0 | 0
Net periodic benefit cost (credit) | 92 | (755) | (305)
Curtailment charge | 0 | 0 | 0
Settlement credit | 49 | 6,373 | 0
Net periodic benefit (credit) cost | 141 | 5,618 | (305)
Changes in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | 35 | 1,611 | 633
Amortization of prior service (cost) credit | 0 | 0 | (41)
Amortization of net actuarial loss | (49) | (43) | (41)
Settlement | (49) | (6,373) | 0
Total recognized in other comprehensive loss (income) | (63) | (4,805) | 551
Total recognized in net periodic cost and other comprehensive loss (income) | 78 | $ 813 | $ 246
Expected future benefit payments |  |  |
2019 | 146 |  |
2020 | 138 |  |
2021 | 129 |  |
2022 | 121 |  |
2023 | 112 |  |
2024 to 2028 | 468 |  |
Total | 1,114 |  |
Foreign Plan | Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | $ 109 |  |
Weighted-average assumptions used to determine benefit obligation |  |  |
Discount rate | 2.72% | 2.45% |
Rate of compensation increase | 3.50% | 3.50% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 2.45% | 2.64% | 3.59%
Expected long-term rate of return on plan assets | 3.80% | 3.90% | 4.60%
Rate of compensation increase | 3.50% | 3.50% | 3.50%
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 12,144 | $ 11,136 |
Service cost | 126 | 132 | $ 103
Interest cost | 280 | 298 | 358
Plan participants' contributions | 13 | 14 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 109 |  |
Actuarial loss (gain) | (514) | 327 |
Foreign exchange | 583 | (1,097) |
Benefits paid | (1,196) | (860) |
Settlement | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | (165) |  |
Change in fair value of plan assets and net accrued liabilities: |  |  |
Benefit obligation at end of year | 10,214 | 12,144 | 11,136
Fair value of plan assets at beginning of year | 11,163 | 9,562 |
Actual return on plan assets | 1,138 | 1,189 |
Employer contributions | 327 | 313 |
Plan participants' contributions | 13 | 14 |
Excess assets transferred to Defined Contribution Plan | 0 | 0 |
Foreign exchange | (603) | 945 |
Benefits paid | (1,196) | (860) |
Settlement | 0 | 0 |
Fair value of plan assets at end of year | 10,842 | 11,163 | 9,562
Funded status at end of year | 628 | (981) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent Other Assets | 1,578 | 0 |
Current Liabilities | (34) | (36) |
Long-Term Liabilities | (916) | (945) |
Net accrued asset (liability) | 628 | (981) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | (109) |  |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | (109) |  |
Net actuarial loss | 42 | (1,245) |
Accumulated Other Comprehensive Loss | (67) | (1,245) |
Components of the net periodic benefit (credit) cost |  |  |
Service cost | 126 | 132 | 103
Interest cost | 280 | 298 | 358
Expected return on plan assets | (403) | (379) | (452)
Amortization of net actuarial loss | 38 | 74 | 27
Amortization of prior service cost (credit) | 0 | 0 | 0
Foreign currency | 35 | (1) | 97
Net periodic benefit cost (credit) | 76 | 124 | 133
Curtailment charge | (165) | 0 | 0
Settlement credit | 0 | 0 | 0
Net periodic benefit (credit) cost | (89) | 124 | 133
Changes in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | (1,249) | (465) | 1,718
Amortization of prior service (cost) credit | (19) | 0 | 0
Amortization of net actuarial loss | (38) | (74) | (27)
Settlement | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | (1,197) | (539) | 1,691
Total recognized in net periodic cost and other comprehensive loss (income) | (1,286) | (415) | $ 1,824
Expected future benefit payments |  |  |
2019 | 243 |  |
2020 | 249 |  |
2021 | 257 |  |
2022 | 265 |  |
2023 | 275 |  |
2024 to 2028 | 1,511 |  |
Total | 2,800 |  |
Nonqualified Plan | Domestic Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 146 |  |
German Pension Plan | Foreign Plan | Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 34 |  |
Accumulated benefit obligations |  |  |
Accumulated benefit obligations | 950 | 1,013 |
Retiree Plan | Domestic Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Expected future employer contributions in the next fiscal year | 779 |  |
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 | 360 |  |
Accumulated benefit obligations |  |  |
Accumulated benefit obligations | $ 9,264 | $ 11,131 |

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