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Pension Plans and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2011
Pension Plans and Other Postretirement Benefits (Tables) [Abstract]  
Change in Benefit Obligations
        Other Postretirement  
 (In thousands) Pension Benefits  Benefits 
 Change in benefit obligations: 2011 2010  2011 2010 
 Net benefit obligation at beginning of year$232,900$208,780 $71,762$66,138 
 Service cost 6,013 5,554  1,920 1,849 
 Interest cost 12,281 11,928  3,980 3,926 
 Plan participants' contributions 0 0  626 569 
 Actuarial (gain) loss 40,925 14,366  22,211 1,866 
 Special termination benefits 13 0  0 0 
 Gross benefits paid (8,464) (7,728)  (3,022) (2,771) 
  Less: federal subsidy on benefits paid 0 0  167 185 
 Benefit obligation at end of year$283,668$232,900 $97,644$71,762 
Assumptions to Determine Benefit Obligations
      Other Postretirement  
   Pension Benefits Benefits 
 Weighted-average assumptions used to       
 determine end of year benefit obligations: 20112010 20112010 
 Discount rate 4.50%5.36% 4.55%5.42% 
 Rate of compensation increase 4.59%4.59% N/AN/A 
Health Care Cost Trends
   20112010 
 Health care cost trend rate assumed for next year 8.0%7.0% 
 Rate to which the cost trend rate is assumed to     
 decline (the ultimate trend rate) 5.0%5.0% 
 Year that the rate reaches the ultimate trend rate 20182015 
Effect of 1% Increase or Decrease in Health Care Costs
 (In thousands) 1% Increase  1% Decrease 
 Effect on other postretirement benefit obligation$16,510 $(13,310) 

 (In thousands) 1% Increase  1% Decrease 
 Effect on total service and interest cost components$1,018 $(819) 
Change in Plan Assets
        Other Postretirement  
 (In thousands) Pension Benefits  Benefits 
 Change in plan assets: 2011 2010  2011 2010 
 Fair value of plan assets at beginning of year$159,354$133,871 $20,949$17,338 
 Actual return on plan assets 3,206 20,226  431 2,254 
 Employer contributions 19,215 12,985  4,472 3,559 
 Plan participants' contributions 0 0  626 569 
 Gross benefits paid (8,464) (7,728)  (3,022) (2,771) 
 Fair value of plan assets at end of year$173,311$159,354 $23,456$20,949 
Asset Allocation of Pension Plans
      Percentage of Plan
   Target  Assets at Year End
   Allocation  2011 2010
 Equity securities 63.0%  64.0% 68.0%
 Debt securities 30.0%  28.0% 26.0%
 Real estate 7.0%  8.0% 6.0%
 Total 100.0%  100.0% 100.0%
Fair Value of Plan Assets
  Fair Value as of December 31, 2011 
 (In thousands) Total Level 1 Level 2 Level 3 
 Cash and Cash Equivalents$2,436$2,436$0$0 
 Equity Securities:         
  U.S. Large Cap 57,629 0 57,629 0 
  U.S. Mid Cap 13,987 0 13,987 0 
  U.S. Small Cap 18,468 0 18,468 0 
  International Blend 32,847 0 32,847 0 
 Fixed Income Securities:         
  Short-Term Fund 2,961 0 2,961 0 
  High Yield Bond 9,829 0 9,829 0 
  Long Duration Bond 42,139 0 42,139 0 
 Real Estate 15,565 0 0 15,565 
 Insurance Continuance Fund 906 0 0 906 
  Total$196,767$2,436$177,860$16,471 
           
  Fair Value as of December 31, 2010 
 (In thousands) Total Level 1 Level 2 Level 3 
 Cash and Cash Equivalents$2,036$2,036$0$0 
 Equity Securities:         
  U.S. Large Cap 54,688 0 54,688 0 
  U.S. Mid Cap 14,115 0 14,115 0 
  U.S. Small Cap 18,189 0 18,189 0 
  International Blend 32,847 0 32,847 0 
 Fixed Income Securities:         
  Short-Term Fund 2,227 0 2,227 0 
  High Yield Bond 8,535 0 8,535 0 
  Long Duration Bond 35,059 0 35,059 0 
 Real Estate 11,604 0 0 11,604 
 Insurance Continuance Fund 1,003 0 0 1,003 
  Total$180,303$2,036$165,660$12,607 
Change in Fair Value of Level 3 Assets
   Level 3 Assets 
     Insurance 
     Continuance 
 (In thousands) Real Estate Fund 
 Balance as of January 1, 2010$10,210$1,008 
  Actual return on plan assets:     
  Relating to assets still held at the reporting date 1,145 48 
  Relating to assets sold during the period (4) 0 
  Purchases, sales, and settlements 253 (53) 
  Transfers in and/or out of Level 3 0 0 
 Balance as of December 31, 2010$11,604$1,003 
  Actual return on plan assets:     
  Relating to assets still held at the reporting date 2,149 46 
  Relating to assets sold during the period 0 0 
  Purchases, sales, and settlements 1,812 (143) 
  Transfers in and/or out of Level 3 0 0 
 Balance as of December 31, 2011$15,565$906 
Funded Status
        Other Postretirement  
 (In thousands) Pension Benefits  Benefits 
 Funded status, end of year 2011 2010  2011 2010 
 Fair Value of plan assets$173,311$159,354 $23,456$20,949 
 Benefit obligations 283,668 232,900  97,644 71,762 
 Funded status$(110,357)$(73,546) $(74,188)$(50,813) 
Amounts Recognized in Regulatory Asset
      Other Postretirement 
 (In thousands) Pension Benefits  Benefits 
 Amounts recognized as regulatory asset 2011 2010  2011 2010 
 Net actuarial loss$110,989$63,008 $34,928$12,131 
 Prior service cost 1,447 1,880  640 750 
 Transition obligation 0 0  463 890 
 Total$112,436$64,888 $36,031$13,771 
Projected Benefit and Accumulated Benefit Obligations in Excess of Plan Assets
        
   Pension Benefits 
 (In thousands) 2011 2010 
 Projected benefit obligation, end of year$283,668$232,900 
 Accumulated benefit obligation, end of year 245,918 200,946 
 Fair value of plan assets, end of year 173,311 159,354 
        
Benefit Payments
   Pension Other Postretirement 
     Gross Expected Net 
   Pension Postretirement Medicare Part D Postretirement 
 (In thousands) Benefits Benefits Subsidy Benefits 
 2012$9,721$2,881$(199)$2,682 
 2013 10,423 3,197 (228) 2,969 
 2014 11,172 3,462 (261) 3,201 
 2015 12,014 3,752 (298) 3,454 
 2016 12,758 4,140 (334) 3,806 
 2017 - 2021 78,493 28,124 (2,206) 25,918 
Net Periodic Benefit Cost
 (In thousands) Pension Benefits Other Postretirement Benefits
 Components of net periodic benefit cost 2011 2010 2009 2011 2010 2009
 Service cost$6,013$5,554$5,235$1,920$1,849$1,783
 Interest cost 12,281 11,928 11,430 3,980 3,926 3,801
 Expected return on assets (14,034) (11,530) (9,016) (1,584) (1,317) (1,005)
 Special Termination Benefits 13 0 0 0 0 0
 Amortization of:            
  Transition obligation 0 0 143 427 427 427
  Prior service cost 433 437 440 110 110 130
  Actuarial loss 3,771 3,401 4,748 566 403 581
 Net periodic benefit cost$8,477$9,790$12,980$5,419$5,398$5,717
 Weighted-average assumptions used to             
 determine net periodic cost:            
 Discount rate 5.36% 5.87% 6.11% 5.42% 5.92% 6.11%
 Expected return on plan assets 8.25% 8.50% 8.50% 7.39% 7.44% 7.11%
 Rate of compensation increase 4.59% 4.59% 4.58% N/A N/A N/A