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Employee Benefit Plans
3 Months Ended
Jun. 30, 2011
Compensation and Retirement Disclosure [Abstract]  
13. Employee Benefit Plans
13. Employee Benefit Plans
 
The components of the net periodic benefit costs with respect to postretirement benefits were as follows:
 
   
Quarter Ended June 30,
 
   
2011
  
2010
 
   
(Unaudited)
 
   
(In thousands)
 
Service cost for benefits earned during the period
 $129  $115 
Interest cost on accumulated postretirement benefit
  142   142 
Other components
  (4)  (9)
Net periodic postretirement benefit cost
 $267  $248