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Employee Benefits
 3 Months Ended
Mar. 31, 2015
Employee Benefits [Abstract]  
Employee Benefits
Note 10.   Employee Benefits

The components of net periodic benefit cost (credit) for our defined benefit plans and postretirement benefit plans for the three months ended March 31, 2015 and 2014 were as follows (in thousands):

  
Three Months Ended
 
  
March 31,
 
Pension benefits
 
2015
  
2014
 
Service cost                                                                                              
 
$
—
  
$
41
 
Interest cost                                                                                              
  
54
   
65
 
Amortization of prior service cost                                                                                              
  
—
   
—
 
Actuarial net loss                                                                                              
  
184
   
57
 
Net periodic benefit cost                                                                                                  
 
$
238
  
$
163
 
         
Postretirement benefits
        
Service cost                                                                                              
 
$
—
  
$
—
 
Interest cost                                                                                              
  
7
   
8
 
Amortization of prior service cost                                                                                              
  
(29
)
  
(754
)
Actuarial net loss                                                                                              
  
434
   
535
 
Net periodic benefit cost (credit)                                                                                                  
 
$
412
  
$
(211
)

For the three months ended March 31, 2015, we made employee benefit contributions of $0.2 million related to our postretirement plans.  Based on current actuarial estimates, we believe we will be required to make approximately $2.3 million in contributions for 2015.
We maintain a Supplemental Executive Retirement Plan ("SERP") for key employees. Under the plan, these employees may elect to defer a portion of their compensation and, in addition, we may at our discretion make contributions to the plan on behalf of the employees. In March 2015, contributions of $0.5 million were made related to calendar year 2014.
We also have an Employee Stock Ownership Plan and Trust for employees who are not covered by a collective bargaining agreement.  In connection therewith, we maintain an employee benefits trust to which we contribute shares of treasury stock.  We are authorized to instruct the trustees to distribute such shares toward the satisfaction of our future obligations under the plan. The shares held in trust are not considered outstanding for purposes of calculating earnings per share until they are committed to be released.  The trustees will vote the shares in accordance with their fiduciary duties.  During the three months ended March 31, 2015, we contributed to the trust an additional 58,000 shares from our treasury and released 58,200 shares from the trust leaving 200 shares remaining in the trust as of March 31, 2015.