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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2017
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
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost, net
$
141

 
$
117

 
$
3,988

 
$
4,145

 
$
—

 
$
—

 
$
4,129

 
$
4,262

Interest cost on projected benefit obligations
1,094

 
1,292

 
2,052

 
2,647

 
18

 
19

 
3,164

 
3,958

Expected return on plan assets
(1,684
)
 
(2,099
)
 
(7,322
)
 
(8,247
)
 
—

 
—

 
(9,006
)
 
(10,346
)
Recognition of prior service cost
—

 
—

 
(1,879
)
 
(1,261
)
 
(195
)
 
(469
)
 
(2,074
)
 
(1,730
)
Recognition of actuarial losses/(gains)
1,639

 
1,890

 
5,947

 
4,473

 
(473
)
 
(673
)
 
7,113

 
5,690

Net periodic pension cost/(credit)
$
1,190

 
$
1,200

 
$
2,786

 
$
1,757

 
$
(650
)
 
$
(1,123
)
 
$
3,326

 
$
1,834