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Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]  
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 June 30:
 
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
$
145

 
$
208

 
$
4,153

 
$
4,711

 
$
—

 
$
—

 
$
4,298

 
$
4,919

Interest cost on projected benefit obligations
1,072

 
1,608

 
2,673

 
3,515

 
19

 
35

 
3,764

 
5,158

Expected return on plan assets
(1,945
)
 
(2,394
)
 
(8,341
)
 
(9,340
)
 
—

 
—

 
(10,286
)
 
(11,734
)
Recognition of prior service cost
—

 
—

 
(1,278
)
 
(984
)
 
(469
)
 
(469
)
 
(1,747
)
 
(1,453
)
Recognition of actuarial losses/(gains)
1,902

 
1,907

 
4,563

 
3,817

 
(673
)
 
(843
)
 
5,792

 
4,881

Settlement charge
7,963

 
—

 
—

 
—

 
—

 
—

 
7,963

 
—

Net periodic pension cost/(credit)
$
9,137

 
$
1,329

 
$
1,770

 
$
1,719

 
$
(1,123
)
 
$
(1,277
)
 
$
9,784

 
$
1,771



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 six months ended June 30:

 
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
$
262

 
$
417

 
$
8,383

 
$
9,456

 
$
—

 
$
—

 
$
8,645

 
$
9,873

Interest cost on projected benefit obligations
2,364

 
3,216

 
5,345

 
7,069

 
38

 
69

 
7,747

 
10,354

Expected return on plan assets
(4,044
)
 
(4,788
)
 
(16,681
)
 
(18,639
)
 
—

 
—

 
(20,725
)
 
(23,427
)
Recognition of prior service cost
—

 
—

 
(2,556
)
 
(1,957
)
 
(938
)
 
(938
)
 
(3,494
)
 
(2,895
)
Recognition of actuarial losses/(gains)
3,792

 
3,814

 
9,053

 
7,635

 
(1,346
)
 
(1,685
)
 
11,499

 
9,764

Settlement charge
7,963

 
—

 
—

 
—

 
—

 
—

 
7,963

 
—

Net periodic pension cost/(credit)
$
10,337

 
$
2,659

 
$
3,544

 
$
3,564

 
$
(2,246
)
 
$
(2,554
)
 
$
11,635

 
$
3,669