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Employee benefit plans (Tables)
6 Months Ended
Jun. 30, 2014
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost

Components of net periodic benefit cost are as follows:

 

     Pension Benefits     Postretirement Life
Insurance Benefits
 

Three months ended June 30,

   2014     2013     2014    2013  

Net periodic pension cost:

         

Service cost

          $ 10   

Interest cost

   $ 169      $ 161           34   

Expected return on plan assets

     (227     (206     

Amortization of prior service cost

         

Amortization of unrecognized net loss

     23        45           29   
  

 

 

   

 

 

   

 

  

 

 

 

Net periodic pension cost

   $ (35   $           $ 73   
  

 

 

   

 

 

   

 

  

 

 

 
     Pension Benefits     Postretirement Life
Insurance Benefits
 

Six months ended June 30,

   2014     2013     2014    2013  

Net periodic pension cost:

         

Service cost

          $ 21   

Interest cost

   $ 338      $ 323           67   

Expected return on plan assets

     (454     (413     

Amortization of prior service cost

         

Amortization of unrecognized net loss

     46        90           58   
  

 

 

   

 

 

   

 

  

 

 

 

Net periodic pension cost

   $ (70   $           $ 146