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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2016
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost, net
$
117

 
$
209

 
$
4,145

 
$
4,745

 
$
—

 
$
—

 
$
4,262

 
$
4,954

Interest cost on projected benefit obligations
1,292

 
1,608

 
2,647

 
3,554

 
19

 
35

 
3,958

 
5,197

Expected return on plan assets
(2,099
)
 
(2,394
)
 
(8,247
)
 
(9,299
)
 
—

 
—

 
(10,346
)
 
(11,693
)
Recognition of prior service cost
—

 
—

 
(1,261
)
 
(973
)
 
(469
)
 
(469
)
 
(1,730
)
 
(1,442
)
Recognition of actuarial losses/(gains)
1,890

 
1,907

 
4,473

 
3,819

 
(673
)
 
(843
)
 
5,690

 
4,883

Net periodic pension cost/(credit)
$
1,200

 
$
1,330

 
$
1,757

 
$
1,846

 
$
(1,123
)
 
$
(1,277
)
 
$
1,834

 
$
1,899