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Employee Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31
 
2014
 
2013
 
2014
 
2013
Service cost
$
11

 
$
14

 
$
4

 
$
4

Interest cost
68

 
64

 
9

 
8

Expected return on plan assets
(82
)
 
(81
)
 
—

 
—

Recognized net actuarial loss
24

 
34

 
—

 
—

Curtailment (see Note 3)
—

 
(26
)
 
—

 
—

Other
5

 
(3
)
 
—

 
—

Net periodic benefit cost
$
26

 
$
2

 
$
13

 
$
12