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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Net periodic benefit cost
Net periodic pension cost for the Company’s defined benefit pension plans and U.S. post-retirement medical plan includes the following components for the three months ended March 31:
 
U.S. Pension Benefits
 
Non-U.S. Pension Benefits
 
Other U.S. Post-retirement Benefits
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost, net
$
123

 
$
114

 
$
4,369

 
$
3,638

 
$
54

 
$
83

Interest cost on projected benefit obligations
1,439

 
1,523

 
4,883

 
5,605

 
101

 
135

Expected return on plan assets
(1,788
)
 
(1,741
)
 
(8,692
)
 
(8,234
)
 
—

 
—

Recognition of prior service cost
—

 
—

 
(994
)
 
(357
)
 
22

 
—

Recognition of actuarial losses/(gains)
1,945

 
1,916

 
1,846

 
613

 
(247
)
 
(188
)
Net periodic pension cost/(credit)
$
1,719

 
$
1,812

 
$
1,412

 
$
1,265

 
$
(70
)
 
$
30