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Employee benefit plans (Tables)
 6 Months Ended
Jun. 30, 2011
Employee benefit plans [Abstract]  
Employee benefit plans Table
Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans were as follows:

Three Months
 
Pension Benefits
  
Other
Postretirement
Benefits
 
Ended June 30,
 
2011
  
2010
  
2011
  
2010
 
   
(In thousands)
 
Components of net periodic benefit cost:
            
Service cost
 $827  $501  $383  $374 
Interest cost
  4,959   4,004   1,161   1,317 
Expected return on assets
  (5,727)  (4,992)  (1,308)  (1,577)
Amortization of prior service cost (credit)
  44   31   (669)  (915)
Amortization of net actuarial (gain) loss
  1,049   256   (53)  67 
Amortization of net transition obligation
  -   -   531   613 
Curtailment loss
  1,218   -   -   - 
Net periodic benefit cost, including amount capitalized
  2,370   (200)  45   (121)
Less amount capitalized
  287   107   (28)  37 
Net periodic benefit cost
 $2,083  $(307) $73  $(158)
                  
Six Months
 
Pension Benefits
  
Other
Postretirement
Benefits
 
Ended June 30,
  2011   2010   2011   2010 
   
(In thousands)
 
Components of net periodic benefit cost:
                
Service cost
 $1,654  $1,305  $722  $731 
Interest cost
  9,919   8,930   2,350   2,594 
Expected return on assets
  (11,427)  (10,684)  (2,526)  (2,969)
Amortization of prior service cost (credit)
  87   69   (1,338)  (1,779)
Amortization of net actuarial loss
  2,592   1,228   258   455 
Amortization of net transition obligation
  -   -   1,062   1,145 
Curtailment loss
  1,218   -   -   - 
Net periodic benefit cost, including amount capitalized
  4,043   848   528   177 
Less amount capitalized
  535   383   (95)  84 
Net periodic benefit cost
 $3,508  $465  $623  $93