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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2014
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
 
Total
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost, net
$
223

 
$
123

 
$
3,962

 
$
4,369

 
$
43

 
$
54

 
$
4,228

 
$
4,546

Interest cost on projected benefit obligations
1,599

 
1,439

 
5,483

 
4,883

 
60

 
101

 
7,142

 
6,423

Expected return on plan assets
(2,137
)
 
(1,788
)
 
(9,544
)
 
(8,692
)
 
—

 
—

 
(11,681
)
 
(10,480
)
Recognition of prior service cost
—

 
—

 
(1,040
)
 
(994
)
 
(195
)
 
22

 
(1,235
)
 
(972
)
Recognition of actuarial losses/(gains)
1,200

 
1,945

 
1,106

 
1,846

 
(359
)
 
(247
)
 
1,947

 
3,544

Net periodic pension cost/(credit)
$
885

 
$
1,719

 
$
(33
)
 
$
1,412

 
$
(451
)
 
$
(70
)
 
$
401

 
$
3,061