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Employee Benefit Plans
6 Months Ended
Jun. 30, 2011
Employee Benefit Plans [Abstract]  
Employee Benefit Plans
Note E — Employee Benefit Plans
Net periodic benefit cost included the following components for the three months ended June 30:
                                 
                    Other Post-retirement  
    Pension Benefits     Benefits  
    2011     2010     2011     2010  
    (in thousands)  
 
                               
Service cost
  $ 3,195     $ 3,734     $     $  
Interest cost
    24,077       24,228       116       156  
Expected return on plan assets
    (31,073 )     (28,450 )            
Amortization of prior service credit
    (1,753 )     (1,733 )     (265 )     (265 )
Amortization of actuarial loss
    12,678       9,399       434       448  
 
                       
Net periodic benefit cost
  $ 7,124     $ 7,178     $ 285     $ 339  
 
                       
Net periodic benefit cost included the following components for the six months ended June 30:
                                 
                    Other Post-retirement  
    Pension Benefits     Benefits  
    2011     2010     2011     2010  
    (in thousands)  
 
Service cost
  $ 6,382     $ 7,505     $     $  
Interest cost
    48,141       48,543       233       312  
Expected return on plan assets
    (62,126 )     (57,018 )            
Amortization of prior service credit
    (3,503 )     (3,483 )     (530 )     (530 )
Amortization of actuarial loss
    25,349       18,821       867       896  
 
                       
Net periodic benefit cost
  $ 14,243     $ 14,368     $ 570     $ 678  
 
                       
Pension benefits also include amounts related to a supplemental retirement plan. During the six months ended June 30, 2011, the Company did not make a contribution to the pension plan.