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Retirement Benefit Plans Part 2 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
U.S. Pension Benefits [Member]
      
Accumulated benefit obligations [Abstract]      
Accumulated benefit obligations $ 42,909 $ 37,472  
Number of participants in US pension plan 450    
Number of active employees participating in U.S. Pension Plan 114    
Expected future employer contributions in next fiscal year 1,742    
Target allocation of investments in equity securities (in hundredths) 60.00%    
Target allocation of investments in debt securities (in hundredths) 40.00%    
Weighted-average assumptions used to determine benefit obligations [Abstract]      
Discount rate (in hundredths) 4.39% 5.39%  
Rate of compensation increase (in hundredths) 3.00% 3.00%  
Weighted-average assumptions used to determine net periodic benefit costs [Abstract]      
Discount rate (in hundredths) 5.39% 5.88% 6.90%
Expected long-term rate of return on plan assets (in hundredths) 7.70% 7.70% 8.75%
Rate of compensation increase (in hundredths) 3.00% 3.00% 4.00%
Plans with accumulated benefit obligation in excess of plan assets [Abstract]      
Projected benefit obligation 44,280 38,885  
Accumulated benefit obligation 42,909 37,472  
Fair value of plan assets 28,237 29,483  
Change in benefit obligation [Roll forward]      
Benefit obligation at beginning of year 38,885 36,034  
Service cost 651 657 648
Interest cost 2,013 2,032 2,116
Plan participants' contributions 0 0  
Plan amendments 233 0  
Actuarial loss (gain) 4,216 1,842  
Benefits paid (1,718) (1,680)  
Benefit obligation at end of year 44,280 38,885 36,034
Change in fair value of plan assets and net accrued liabilities [Roll forward]      
Fair value of plan assets at beginning of year 29,483 27,438  
Actual return on plan assets 357 3,610  
Employer contributions 115 115  
Plan participants' contributions 0 0  
Foreign exchange 0 0  
Benefits paid (1,718) (1,680)  
Fair value of plan assets at end of year 28,237 29,483 27,438
Funded status at end of year (16,043) (9,402)  
Amounts recognized in the consolidated balance sheets consisted of [Abstract]      
Current liabilities (129) (131)  
Noncurrent liabilities (15,914) (9,271)  
Net accrued liability (16,043) (9,402)  
Amounts recognized in accumulated other comprehensive income (loss) consist of [Abstract]      
Prior service cost 606 923  
Net actuarial loss 12,488 6,331  
Accumulated other comprehensive income 13,094 7,254  
Components of the net periodic benefit cost [Abstract]      
Service cost 651 657 648
Interest cost 2,013 2,032 2,116
Expected return on plan assets (2,325) (2,340) (2,767)
Amortization of net actuarial loss (gain) 27 22 (151)
Amortization of transition (asset) obligation 0 0 (20)
Amortization of prior service cost 550 554 555
Foreign currency 0 0 0
Net periodic benefit cost 916 925 381
Changes in accumulated other comprehensive income [Abstract]      
Prior service cost 233 0 0
Net actuarial loss (gain) 6,184 573 387
Amortization of prior service cost (550) (554) (555)
Amortization of prior transition asset 0 0 20
Amortization of net actuarial (loss) gain (27) (22) 151
Total recognized in other comprehensive income 5,840 (3) 3
Total recognized in net periodic benefit cost and other comprehensive income 6,756 922 384
Expected future benefit payments [Abstract]      
2012 1,659    
2013 1,846    
2014 2,088    
2015 2,368    
2016 2,541    
2017 to 2021 14,423    
Total 24,925    
U.K. Pension Plan [Member]
      
Accumulated benefit obligations [Abstract]      
Accumulated benefit obligations 7,858 7,498  
Expected future employer contributions in next fiscal year 214    
German Pension Plan [Member]
      
Accumulated benefit obligations [Abstract]      
Accumulated benefit obligations 652 676  
Expected future employer contributions in next fiscal year 38    
U.S. Nonqualified Plan [Member]
      
Accumulated benefit obligations [Abstract]      
Expected future employer contributions in next fiscal year 129    
Postretirement Medical Benefits [Member]
      
Accumulated benefit obligations [Abstract]      
Expected future employer contributions in next fiscal year 841    
Weighted-average assumptions used to determine benefit obligations [Abstract]      
Discount rate (in hundredths) 4.20% 5.00%  
Rate of compensation increase (in hundredths) 0.00% 0.00%  
Weighted-average assumptions used to determine net periodic benefit costs [Abstract]      
Discount rate (in hundredths) 5.00% 5.60% 6.90%
Expected long-term rate of return on plan assets (in hundredths) 0.00% 0.00% 0.00%
Rate of compensation increase (in hundredths) 0.00% 0.00% 0.00%
Assumed healthcare cost trend rates [Abstract]      
Healthcare cost trend rate assumption for the next year (in hundredths) 10.14% 11.25%  
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (in hundredths) 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 [Abstract]      
Effect of one-percentage-point decrease on total of service and interest cost components (65)    
Effect of one-percentage-point increase on total of service and interest cost components 75    
Effect one-percentage-point decrease on postretirement benefit obligation (1,121)    
Effect one-percentage-point increase on postretirement benefit obligation 1,288    
Change in benefit obligation [Roll forward]      
Benefit obligation at beginning of year 13,423 14,323  
Service cost 132 121 141
Interest cost 612 681 854
Plan participants' contributions 0 0  
Actuarial loss (gain) 72 (892)  
Foreign exchange 0 0  
Benefits paid (531) (810)  
Benefit obligation at end of year 13,708 13,423 14,323
Change in fair value of plan assets and net accrued liabilities [Roll forward]      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 531 810  
Plan participants' contributions 0 0  
Foreign exchange 0 0  
Benefits paid (531) (810)  
Fair value of plan assets at end of year 0 0 0
Funded status at end of year (13,708) (13,423)  
Amounts recognized in the consolidated balance sheets consisted of [Abstract]      
Current liabilities (841) (855)  
Noncurrent liabilities (12,867) (12,568)  
Net accrued liability (13,708) (13,423)  
Amounts recognized in accumulated other comprehensive income (loss) consist of [Abstract]      
Prior service cost (689) (1,268)  
Net actuarial loss 1,921 1,849  
Accumulated other comprehensive income 1,232 581  
Components of the net periodic benefit cost [Abstract]      
Service cost 132 121 141
Interest cost 612 681 854
Expected return on plan assets 0 0 0
Amortization of net actuarial loss (gain) 0 0 0
Amortization of transition (asset) obligation 0 0 0
Amortization of prior service cost (580) (579) (580)
Foreign currency 0 0 0
Net periodic benefit cost 164 223 415
Changes in accumulated other comprehensive income [Abstract]      
Net actuarial loss (gain) 72 (892) 1,823
Amortization of prior service cost 580 580 580
Amortization of prior transition asset 0 0 0
Amortization of net actuarial (loss) gain 0 0 0
Total recognized in other comprehensive income 652 (312) 2,403
Total recognized in net periodic benefit cost and other comprehensive income 816 (89) 2,818
Expected future benefit payments [Abstract]      
2012 841    
2013 914    
2014 1,012    
2015 1,096    
2016 1,166    
2017 to 2021 5,888    
Total 10,917    
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year [Abstract]      
Net loss   67  
Net prior service cost (credit)   (580)  
Non-U.S. Pension Benefits [Member]
      
Weighted-average assumptions used to determine benefit obligations [Abstract]      
Discount rate (in hundredths) 4.94% 5.39%  
Rate of compensation increase (in hundredths) 4.60% 5.10%  
Weighted-average assumptions used to determine net periodic benefit costs [Abstract]      
Discount rate (in hundredths) 5.39% 5.69% 6.16%
Expected long-term rate of return on plan assets (in hundredths) 5.20% 5.50% 4.90%
Rate of compensation increase (in hundredths) 5.10% 5.10% 4.50%
Plans with accumulated benefit obligation in excess of plan assets [Abstract]      
Projected benefit obligation 8,775 8,394  
Accumulated benefit obligation 8,510 8,174  
Fair value of plan assets 7,738 6,917  
Change in benefit obligation [Roll forward]      
Benefit obligation at beginning of year 8,394 7,994  
Service cost 133 117 97
Interest cost 465 434 406
Plan participants' contributions 24 25  
Actuarial loss (gain) 40 250  
Foreign exchange (63) (294)  
Benefits paid (218) (132)  
Benefit obligation at end of year 8,775 8,394 7,994
Change in fair value of plan assets and net accrued liabilities [Roll forward]      
Fair value of plan assets at beginning of year 6,917 6,451  
Actual return on plan assets 715 454  
Employer contributions 352 338  
Plan participants' contributions 24 25  
Foreign exchange (52) (219)  
Benefits paid (218) (132)  
Fair value of plan assets at end of year 7,738 6,917 6,451
Funded status at end of year (1,037) (1,477)  
Amounts recognized in the consolidated balance sheets consisted of [Abstract]      
Current liabilities (38) (38)  
Noncurrent liabilities (999) (1,439)  
Net accrued liability (1,037) (1,477)  
Amounts recognized in accumulated other comprehensive income (loss) consist of [Abstract]      
Prior service cost 0 0  
Net actuarial loss 2,000 302  
Accumulated other comprehensive income 2,000 302  
Components of the net periodic benefit cost [Abstract]      
Service cost 133 117 97
Interest cost 465 434 406
Expected return on plan assets (376) (346) (276)
Amortization of net actuarial loss (gain) 0 0 0
Amortization of transition (asset) obligation 0 0 0
Amortization of prior service cost 0 0 0
Foreign currency (18) (65) 61
Net periodic benefit cost 204 140 288
Changes in accumulated other comprehensive income [Abstract]      
Net actuarial loss (gain) (300) 143 502
Amortization of prior service cost 0 0 0
Amortization of prior transition asset 0 0 0
Amortization of net actuarial (loss) gain 0 0 0
Total recognized in other comprehensive income (300) 143 502
Total recognized in net periodic benefit cost and other comprehensive income (96) 283 790
Expected future benefit payments [Abstract]      
2012 178    
2013 183    
2014 187    
2015 192    
2016 196    
2017 to 2021 1,059    
Total 1,995    
Pension Benefits [Member]
      
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year [Abstract]      
Net loss 1,030    
Net prior service cost (credit) $ 388