Retirement Benefit Plans Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
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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Defined Benefit Plan, Excess Assets Transferred

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The total amount of the aggregate benefits expected to be paid.

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Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Before Curtailment And Settlement Charge

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Total amounts recognized in in net periodic benefit cost and other comprehensive income, including the net gain (loss) and amortization of net prior service cost (credit), prior transition assets and net actuarial gain (loss) arising during the period.

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The amount of foreign currency recognized in net periodic benefit cost relating to benefit changes attributable to the company's operations in foreign counties

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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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.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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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.

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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.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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