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Retirement Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
U.S. Pension Benefits
        
Components of the net periodic benefit cost        
Service cost $ 216 $ 174 $ 432 $ 339
Interest cost 563 483 1,131 961
Expected return on plan assets (910) (569) (1,820) (1,140)
Amortization of net actuarial loss (gain) 1,073 282 1,096 568
Amortization of prior service cost (503) 95 46 192
Foreign currency 0 0 0 0
Net periodic benefit cost 439 465 885 920
Non-U.S. Pension Benefits
        
Components of the net periodic benefit cost        
Service cost 33 33 66 66
Interest cost 121 131 243 261
Expected return on plan assets (115) (118) (231) (235)
Amortization of net actuarial loss (gain) 0 0 0 0
Amortization of prior service cost 80 39 161 77
Foreign currency (13) 45 29 23
Net periodic benefit cost 106 130 268 192
Postretirement Medical Benefits
        
Components of the net periodic benefit cost        
Service cost 38 35 76 70
Interest cost 110 139 222 279
Expected return on plan assets 0 0 0 0
Amortization of net actuarial loss (gain) 127 17 101 34
Amortization of prior service cost (102) (145) (52) (290)
Foreign currency 0 0 0 0
Net periodic benefit cost 173 46 347 93
Employer contributions to pension and postretirement medial benefit plans 83   229  
Pension Benefits
        
Components of the net periodic benefit cost        
Employer contributions to pension and postretirement medial benefit plans $ 68   $ 137