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Employee Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31
 
2016
 
2015
 
2016
 
2015
Service cost
$
14

 
$
10

 
$
3

 
$
4

Interest cost
38

 
64

 
8

 
8

Expected return on plan assets
(41
)
 
(75
)
 
—

 
—

Recognized net actuarial loss
13

 
29

 
—

 
—

Settlements
—

 
9

 
—

 
—

Other
(3
)
 
(5
)
 
—

 
—

Net periodic benefit cost
$
21

 
$
32

 
$
11

 
$
12