Merck & Co. Inc. | 2013 | FY | 3

The net periodic benefit cost for pension and other postretirement benefit plans consisted of the following components:
 
Pension Benefits
 
Other Postretirement Benefits
Years Ended December 31
2013
 
2012
 
2011
 
2013
 
2012
 
2011
Service cost
$
682

 
$
555

 
$
619

 
$
102

 
$
82

 
$
110

Interest cost
665

 
661

 
718

 
107

 
121

 
141

Expected return on plan assets
(1,097
)
 
(970
)
 
(972
)
 
(126
)
 
(136
)
 
(142
)
Net amortization
336

 
185

 
201

 
(50
)
 
(35
)
 
(17
)
Termination benefits
58

 
27

 
59

 
50

 
18

 
29

Curtailments
(23
)
 
(10
)
 
(86
)
 
(11
)
 
(7
)
 
1

Settlements
23

 
18

 
4

 
—

 
—

 
—

Net periodic benefit cost
$
644

 
$
466

 
$
543

 
$
72

 
$
43

 
$
122

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