Retirement Benefit Plans Part 2 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans
Discretionary contribution made to pension plan	$ 0us-gaap_PensionContributions	$ 0us-gaap_PensionContributions	$ 16,731us-gaap_PensionContributions
Plans with accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	13,872	12,778
Fair value of plan assets	9,989	9,733
Plans with projected benefit obligation in excess of plan assets
Projected benefit obligation	14,207	13,481
Fair value of plan assets	9,989	9,733
Changes in accumulated other comprehensive income:
Total recognized in other comprehensive loss (income)	5,382	(12,282)	2,534
Pension Benefits
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Net actuarial loss	1,561
Prior service cost	42
U.S. Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Number of participants in U.S. Pension Plan	394
Number of active employees participating in U.S. Pension Plan	81
Discretionary contribution made to pension plan			15,000
Expected future employer contributions in the next fiscal year	0
Weighted-average assumptions used to determine benefit obligation
Discount rate	3.76%	4.63%
Rate of compensation increase	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	4.63%	3.79%	4.39%
Expected long-term rate of return on plan assets	5.70%	6.50%	7.70%
Rate of compensation increase	3.00%	3.00%	3.00%
Accumulated benefit obligations
Accumulated benefit obligations	45,695	42,241
Change in benefit obligation:
Benefit obligation at beginning of year	43,653	48,824
Service cost	493	690	686
Interest cost	1,964	1,803	1,928
Plan participants' contributions	0	0
Actuarial loss (gain)	5,907	(4,901)
Foreign exchange	0	0
Benefits paid	(1,706)	(2,763)
Settlement	(3,284)	0
Benefit obligation at end of year	47,027	43,653	48,824
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year	52,397	46,942
Actual return on plan assets	4,236	7,827
Employer contributions	242	391
Plan participants' contributions	0	0
Foreign exchange	0	0
Benefits paid	(1,706)	(2,763)
Settlement	(3,284)	0
Fair value of plan assets at end of year	51,885	52,397	46,942
Funded status at end of year	4,858	8,744
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	7,051	10,987
Current Liabilities	(185)	(149)
Long-Term Liabilities	(2,008)	(2,094)
Net accrued asset (liability)	4,858	8,744
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service (cost) credit	(109)	(152)
Net actuarial loss	(5,993)	(2,142)
Accumulated Other Comprehensive Loss	(6,102)	(2,294)
Components of the net periodic benefit cost
Service cost	493	690	686
Interest cost	1,964	1,803	1,928
Expected return on plan assets	(2,683)	(2,911)	(2,279)
Amortization of net actuarial loss	147	1,751	1,131
Amortization of prior service cost (credit)	43	73	382
Foreign currency	0	0	0
Settlement credit	356	0	0
Net periodic benefit cost	320	1,406	1,848
Changes in accumulated other comprehensive income:
Net actuarial loss (gain)	4,353	(9,817)	2,355
Amortization of prior service (cost) credit	(43)	(73)	(382)
Amortization of net actuarial loss	(503)	(1,751)	(1,132)
Total recognized in other comprehensive loss (income)	3,807	(11,641)	841
Total recognized in net periodic benefit (cost) and other comprehensive loss (income)	4,127	(10,235)	2,689
Expected future benefit payments
2015	2,239
2016	2,419
2017	2,577
2018	2,724
2019	2,822
2020 to 2024	15,135
Total	27,916
U.S. Pension Plan \| Debt Securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Target allocation of investments	60.00%
U.S. Pension Plan \| Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Target allocation of investments	40.00%
U.S. Nonqualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	185
Non-U.S. Pension Benefits
Weighted-average assumptions used to determine benefit obligation
Discount rate	3.38%	4.33%
Rate of compensation increase	3.50%	4.50%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	4.33%	4.41%	4.94%
Expected long-term rate of return on plan assets	5.60%	4.70%	4.80%
Rate of compensation increase	4.50%	4.50%	4.60%
Change in benefit obligation:
Benefit obligation at beginning of year	11,238	10,011
Service cost	155	142	138
Interest cost	476	422	437
Plan participants' contributions	21	23
Actuarial loss (gain)	1,421	668
Foreign exchange	(815)	265
Benefits paid	(482)	(293)
Settlement	0	0
Benefit obligation at end of year	12,014	11,238	10,011
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year	9,733	8,855
Actual return on plan assets	974	601
Employer contributions	365	343
Plan participants' contributions	21	23
Foreign exchange	(622)	204
Benefits paid	(482)	(293)
Settlement	0	0
Fair value of plan assets at end of year	9,989	9,733	8,855
Funded status at end of year	(2,025)	(1,505)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	0	0
Current Liabilities	(37)	(41)
Long-Term Liabilities	(1,988)	(1,464)
Net accrued asset (liability)	(2,025)	(1,505)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service (cost) credit	0	0
Net actuarial loss	(1,682)	(704)
Accumulated Other Comprehensive Loss	(1,682)	(704)
Components of the net periodic benefit cost
Service cost	155	142	138
Interest cost	476	422	437
Expected return on plan assets	(539)	(402)	(387)
Amortization of net actuarial loss	9	9	0
Amortization of prior service cost (credit)	0	0	0
Foreign currency	(61)	21	16
Settlement credit	0	0	0
Net periodic benefit cost	40	192	204
Changes in accumulated other comprehensive income:
Net actuarial loss (gain)	987	467	244
Amortization of prior service (cost) credit	0	0	0
Amortization of net actuarial loss	(9)	(9)	0
Total recognized in other comprehensive loss (income)	978	458	244
Total recognized in net periodic benefit (cost) and other comprehensive loss (income)	1,018	650	448
Expected future benefit payments
2015	229
2016	235
2017	241
2018	247
2019	254
2020 to 2024	1,384
Total	2,590
U.K. Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	305
Accumulated benefit obligations
Accumulated benefit obligations	10,658	9,803
German Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	37
Accumulated benefit obligations
Accumulated benefit obligations	1,027	897
Postretirement Medical Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	947
Weighted-average assumptions used to determine benefit obligation
Discount rate	3.39%	4.10%
Rate of compensation increase	0.00%	0.00%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	4.10%	3.27%	4.20%
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%
Assumed healthcare cost trend rates
Healthcare cost trend rate assumption for the next year	7.50%	8.30%
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	2031	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	(46)
Effect of one-percentage-point increase on total of service and interest cost components	52
Effect of one-percentage-point decrease on postretirement benefit obligation	(981)
Effect of one-percentage-point increase on postretirement benefit obligation	1,113
Change in benefit obligation:
Benefit obligation at beginning of year	13,186	14,090
Service cost	128	154	142
Interest cost	497	443	551
Plan participants' contributions	0	0
Actuarial loss (gain)	591	(1,001)
Foreign exchange	0	0
Benefits paid	(1,110)	(500)
Settlement	0	0
Benefit obligation at end of year	13,292	13,186	14,090
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	1,110	500
Plan participants' contributions	0	0
Foreign exchange	0	0
Benefits paid	(1,110)	(500)
Settlement	0	0
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(13,292)	(13,186)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	0	0
Current Liabilities	(947)	(919)
Long-Term Liabilities	(12,345)	(12,267)
Net accrued asset (liability)	(13,292)	(13,186)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service (cost) credit	0	6
Net actuarial loss	(2,178)	(1,587)
Accumulated Other Comprehensive Loss	(2,178)	(1,581)
Components of the net periodic benefit cost
Service cost	128	154	142
Interest cost	497	443	551
Expected return on plan assets	0	0	0
Amortization of net actuarial loss	0	201	57
Amortization of prior service cost (credit)	(6)	(103)	(580)
Foreign currency	0	0	0
Settlement credit	0	0	0
Net periodic benefit cost	619	695	170
Changes in accumulated other comprehensive income:
Net actuarial loss (gain)	591	(1,001)	926
Amortization of prior service (cost) credit	6	103	580
Amortization of net actuarial loss	0	(201)	(57)
Total recognized in other comprehensive loss (income)	597	(1,099)	1,449
Total recognized in net periodic benefit (cost) and other comprehensive loss (income)	1,216	(404)	1,619
Expected future benefit payments
2015	947
2016	1,012
2017	1,063
2018	1,064
2019	1,089
2020 to 2024	5,294
Total	10,469
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Net actuarial loss	140
Prior service cost	$ 0

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

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The amount of increase or decrease in the net periodic benefit cost attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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Number of active employees participating in the defined pension plan.

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Number of plan participants.

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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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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Name Accounting Standards Codification

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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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.

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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