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Pensions and Other Employee Benefit Plans
9 Months Ended
Sep. 30, 2011
Pensions and Other Employee Benefit Plans [Abstract] 
Pensions and Other Employee Benefit Plans
14. Pensions and Other Employee Benefit Plans
The following table provides the components of net periodic cost for our qualified and supplemental retirement plans (the “Pension Benefits”) and health care and life insurance benefits for retired employees and dependents (the “Other Benefits”) for the three months and nine months ended September 30, 2011 and 2010:
                                 
    Pension Benefits     Other Benefits  
    Three Months     Three Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
    (In thousands)     (In thousands)  
Service cost
  $ 3,048     $ 2,596     $ 181     $ 234  
Interest cost
    6,327       6,117       837       981  
Expected return on plan assets
    (5,813 )     (5,157 )     (4 )     (8 )
Amortization of prior service credits and net actuarial loss or (gain)
    711       130       (379 )     (166 )
 
                       
Net periodic cost
  $ 4,273     $ 3,686     $ 635     $ 1,041  
 
                       
                                 
    Pension Benefits     Other Benefits  
    Nine Months     Nine Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
    (In thousands)     (In thousands)  
Service cost
  $ 9,144     $ 7,788     $ 543     $ 702  
Interest cost
    18,981       18,351       2,511       2,943  
Expected return on plan assets
    (17,439 )     (15,471 )     (12 )     (24 )
Amortization of prior service credits and net actuarial loss or (gain)
    2,133       392       (1,137 )     (498 )
 
                       
Net periodic cost
  $ 12,819     $ 11,060     $ 1,905     $ 3,123