Retirement Benefit Plans Part 2 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Plans with accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	$ 12,778	$ 3,261
Fair value of plan assets	9,733	0
Plans with projected benefit obligation in excess of plan assets
Projected benefit obligation	13,481	12,591
Fair value of plan assets	9,733	8,855
Changes in accumulated other comprehensive income:
Total recognized in other comprehensive income	(12,282)	2,534	6,192
Pension Benefits
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Net actuarial loss	185
Prior service cost (credit)	43
U.S. Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Number of participants in U.S. Pension Plan	442
Number of active employees participating in U.S. Pension Plan	90
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	4.63%	3.79%
Rate of compensation increase	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	3.79%	4.39%	5.39%
Expected long-term rate of return on plan assets	6.50%	7.70%	7.70%
Rate of compensation increase	3.00%	3.00%	3.00%
Accumulated benefit obligations
Accumulated benefit obligations	42,241	46,907
Change in benefit obligation:
Benefit obligation at beginning of year	48,824	44,280
Service cost	690	686	651
Interest cost	1,803	1,928	2,013
Plan participants' contributions	0	0
Actuarial loss (gain)	(4,901)	3,893
Foreign exchange	0	0
Benefits paid	(2,763)	(1,963)
Benefit obligation at end of year	43,653	48,824	44,280
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year	46,942	28,237
Actual return on plan assets	7,827	3,818
Employer contributions	391	16,850
Plan participants' contributions	0	0
Foreign exchange	0	0
Benefits paid	(2,763)	(1,963)
Fair value of plan assets at end of year	52,397	46,942	28,237
Funded status at end of year	8,744	(1,882)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	10,987	698
Current Liabilities	(149)	(145)
Long-Term Liabilities	(2,094)	(2,435)
Net accrued asset (liability)	8,744	(1,882)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service (cost) credit	(152)	(224)
Net actuarial loss	(2,142)	(13,711)
Accumulated Other Comprehensive Loss	(2,294)	(13,935)
Components of the net periodic benefit cost
Service cost	690	686	651
Interest cost	1,803	1,928	2,013
Expected return on plan assets	(2,911)	(2,279)	(2,325)
Amortization of net actuarial loss	1,751	1,131	27
Amortization of prior service cost	73	382	550
Foreign currency	0	0	0
Net periodic benefit cost	1,406	1,848	916
Changes in accumulated other comprehensive income:
Prior service cost	0	0	233
Net actuarial (gain) loss	(9,817)	2,355	6,184
Amortization of prior service cost	(73)	(382)	(550)
Amortization of net actuarial loss	(1,751)	(1,132)	(27)
Total recognized in other comprehensive income	(11,641)	841	5,840
Total recognized in net periodic benefit cost and other comprehensive income	(10,235)	2,689	6,756
Expected future benefit payments
2014	2,021
2015	2,353
2016	2,535
2017	2,682
2018	2,808
2019 to 2023	15,087
Total	27,486
U.S. Pension Plan | Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Target allocation of investments	60.00%
U.S. Pension Plan | Debt 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	149
Non-U.S. Pension Benefits
Weighted-average assumptions used to determine benefit obligation
Discount rate	4.33%	4.41%
Rate of compensation increase	4.50%	4.50%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	4.41%	4.94%	5.39%
Expected long-term rate of return on plan assets	4.70%	4.80%	5.20%
Rate of compensation increase	4.50%	4.60%	5.10%
Change in benefit obligation:
Benefit obligation at beginning of year	10,011	8,775
Service cost	142	138	133
Interest cost	422	437	465
Plan participants' contributions	23	24
Actuarial loss (gain)	668	595
Foreign exchange	265	411
Benefits paid	(293)	(369)
Benefit obligation at end of year	11,238	10,011	8,775
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year	8,855	7,738
Actual return on plan assets	601	738
Employer contributions	343	346
Plan participants' contributions	23	24
Foreign exchange	204	378
Benefits paid	(293)	(369)
Fair value of plan assets at end of year	9,733	8,855	7,738
Funded status at end of year	(1,505)	(1,156)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	0	0
Current Liabilities	(41)	(39)
Long-Term Liabilities	(1,464)	(1,117)
Net accrued asset (liability)	(1,505)	(1,156)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service (cost) credit	0	0
Net actuarial loss	(704)	(246)
Accumulated Other Comprehensive Loss	(704)	(246)
Components of the net periodic benefit cost
Service cost	142	138	133
Interest cost	422	437	465
Expected return on plan assets	(402)	(387)	(376)
Amortization of net actuarial loss	9	0	0
Amortization of prior service cost	0	0	0
Foreign currency	21	16	(18)
Net periodic benefit cost	192	204	204
Changes in accumulated other comprehensive income:
Prior service cost	0	0	0
Net actuarial (gain) loss	467	244	(300)
Amortization of prior service cost	0	0	0
Amortization of net actuarial loss	(9)	0	0
Total recognized in other comprehensive income	458	244	(300)
Total recognized in net periodic benefit cost and other comprehensive income	650	448	(96)
Expected future benefit payments
2014	309
2015	319
2016	328
2017	339
2018	350
2019 to 2023	1,916
Total	3,561
U.K. Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	237
Accumulated benefit obligations
Accumulated benefit obligations	9,803	8,837
German Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	41
Accumulated benefit obligations
Accumulated benefit obligations	897	878
Postretirement Medical Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	919
Weighted-average assumptions used to determine benefit obligation
Discount rate	4.10%	3.27%
Rate of compensation increase	0.00%	0.00%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	3.27%	4.20%	5.00%
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	8.30%	9.17%
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	(930)
Effect of one-percentage-point increase on postretirement benefit obligation	1,050
Change in benefit obligation:
Benefit obligation at beginning of year	14,090	13,708
Service cost	154	142	132
Interest cost	443	551	612
Plan participants' contributions	0	0
Actuarial loss (gain)	(1,001)	926
Foreign exchange	0	0
Benefits paid	(500)	(1,237)
Benefit obligation at end of year	13,186	14,090	13,708
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	500	1,237
Plan participants' contributions	0	0
Foreign exchange	0	0
Benefits paid	(500)	(1,237)
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(13,186)	(14,090)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	0	0
Current Liabilities	(919)	(904)
Long-Term Liabilities	(12,267)	(13,186)
Net accrued asset (liability)	(13,186)	(14,090)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service (cost) credit	6	109
Net actuarial loss	(1,587)	(2,789)
Accumulated Other Comprehensive Loss	(1,581)	(2,680)
Components of the net periodic benefit cost
Service cost	154	142	132
Interest cost	443	551	612
Expected return on plan assets	0	0	0
Amortization of net actuarial loss	201	57	0
Amortization of prior service cost	(103)	(580)	(580)
Foreign currency	0	0	0
Net periodic benefit cost	695	170	164
Changes in accumulated other comprehensive income:
Prior service cost	0	0	0
Net actuarial (gain) loss	(1,001)	926	72
Amortization of prior service cost	103	580	580
Amortization of net actuarial loss	(201)	(57)	0
Total recognized in other comprehensive income	(1,099)	1,449	652
Total recognized in net periodic benefit cost and other comprehensive income	(404)	1,619	816
Expected future benefit payments
2014	919
2015	1,026
2016	1,055
2017	1,106
2018	1,091
2019 to 2023	5,349
Total	10,546
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Net actuarial loss	43
Prior service cost (credit)	$ (6)