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Employee benefit plans (Tables)
3 Months Ended
Mar. 31, 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 March 31,

   2014     2013     2014      2013  

Net periodic pension cost:

         

Service cost

     $        $         $ 11   

Interest cost

     169      $ 162           33   

Expected return on plan assets

     (227     (207     

Amortization of prior service cost

         

Amortization of unrecognized net loss

     23        45           29   
  

 

 

   

 

 

   

 

 

    

 

 

 

Net periodic pension cost

   $ (35   $        $         $ 73