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Employee Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of net periodic benefit cost
The table below presents net periodic benefit cost information for defined benefit plans and other postretirement benefit plans:
 
Pension Benefits
 
Other Benefits
 
Three Months Ended September 30
 
2016
 
2015
 
2016
 
2015
Service cost
$
8

 
$
10

 
$
3

 
$
3

Interest cost
35

 
39

 
7

 
8

Expected return on plan assets
(38
)
 
(43
)
 
—

 
—

Recognized net actuarial loss
13

 
13

 
—

 
—

Settlements
—

 
19

 
—

 
—

Other
(2
)
 
(2
)
 
—

 
—

Net periodic benefit cost
$
16

 
$
36

 
$
10

 
$
11


 
Pension Benefits
 
Other Benefits
 
Nine Months Ended September 30
 
2016
 
2015
 
2016
 
2015
Service cost
$
32

 
$
29

 
$
9

 
$
9

Interest cost
110

 
148

 
24

 
25

Expected return on plan assets
(119
)
 
(173
)
 
—

 
—

Recognized net actuarial loss
39

 
61

 
(1
)
 
(1
)
Settlements
—

 
1,348

 
—

 
—

Other
(7
)
 
(9
)
 
—

 
—

Net periodic benefit cost
$
55

 
$
1,404

 
$
32

 
$
33