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Retirement Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
U.S. Pension Benefits
    
Components of the net periodic benefit cost    
Service cost $ 216 $ 165
Interest cost 568 478
Expected return on plan assets (910) (571)
Amortization of net actuarial loss (gain) 23 286
Amortization of prior service cost 549 97
Foreign currency 0 0
Net periodic benefit cost 446 455
Non-U.S. Pension Benefits
    
Components of the net periodic benefit cost    
Service cost 33 33
Interest cost 122 130
Expected return on plan assets (116) (117)
Amortization of net actuarial loss (gain) 0 0
Amortization of prior service cost 81 38
Foreign currency 42 (22)
Net periodic benefit cost 162 62
Postretirement Medical Benefits
    
Components of the net periodic benefit cost    
Service cost 38 35
Interest cost 112 140
Expected return on plan assets 0 0
Amortization of net actuarial loss (gain) (26) 17
Amortization of prior service cost 50 (145)
Foreign currency 0 0
Net periodic benefit cost 174 47
Employer contributions to pension and postretirement medial benefit plans 146  
Pension Benefits
    
Components of the net periodic benefit cost    
Employer contributions to pension and postretirement medial benefit plans $ 69