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Employee Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
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
 
2014
 
2013
 
2014
 
2013
Service cost
$
12

 
$
13

 
$
3

 
$
4

Interest cost
70

 
63

 
9

 
9

Expected return on plan assets
(83
)
 
(82
)
 
—

 
—

Recognized net actuarial loss
25

 
28

 
—

 
2

Curtailment
—

 
(1
)
 
—

 
—

Other
1

 
2

 
—

 
—

Net periodic benefit cost
$
25

 
$
23

 
$
12

 
$
15

 
Pension Benefits
 
Other Benefits
 
Nine Months Ended September 30
 
2014
 
2013
 
2014
 
2013
Service cost
$
36

 
$
40

 
$
9

 
$
12

Interest cost
209

 
191

 
27

 
25

Expected return on plan assets
(249
)
 
(246
)
 
—

 
—

Recognized net actuarial loss
75

 
91

 
—

 
2

Curtailment
—

 
(30
)
 
—

 
—

Other
6

 
(1
)
 
—

 
—

Net periodic benefit cost
$
77

 
$
45

 
$
36

 
$
39