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Postretirement Benefits
6 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Benefits
8. Benefits

 

The following table sets forth the components of net periodic benefit cost of the Company's postretirement benefit plan for the periods presented.

  Three Months Ended June 30, Six Months Ended June 30,
  2011 2010 2011 2010
             
  (In thousands)
             
Service cost$ 638 $ 575 $ 1,275 $ 1,150
Interest cost  950   872   1,900   1,744
Expected return on plan assets  (950)   (838)   (1,900)   (1,675)
Prior service credit amortization  (522)   (522)   (1,044)   (1,044)
Net periodic benefit cost$ 116 $ 87 $ 231 $ 175