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Employee Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 June 30
 
2016
 
2015
 
2016
 
2015
Service cost
$
10

 
$
9

 
$
3

 
$
2

Interest cost
37

 
45

 
9

 
9

Expected return on plan assets
(40
)
 
(55
)
 
—

 
—

Recognized net actuarial loss
13

 
19

 
(1
)
 
(1
)
Settlements
—

 
1,320

 
—

 
—

Other
(2
)
 
(2
)
 
—

 
—

Net periodic benefit cost
$
18

 
$
1,336

 
$
11

 
$
10


 
Pension Benefits
 
Other Benefits
 
Six Months Ended June 30
 
2016
 
2015
 
2016
 
2015
Service cost
$
24

 
$
19

 
$
6

 
$
6

Interest cost
75

 
109

 
17

 
17

Expected return on plan assets
(81
)
 
(130
)
 
—

 
—

Recognized net actuarial loss
26

 
48

 
(1
)
 
(1
)
Settlements
—

 
1,329

 
—

 
—

Other
(5
)
 
(7
)
 
—

 
—

Net periodic benefit cost
$
39

 
$
1,368

 
$
22

 
$
22