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Benefit Costs and Assumptions (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost $ 2,252,000 $ 2,889,000 $ 8,127,000
Interest cost 19,500,000 19,761,000 21,919,000
Expected return on assets (22,809,000) (23,643,000) (25,062,000)
Amortization of prior service cost (credit) 45,000 152,000 605,000
Recognized net actuarial loss 4,656,000 2,622,000 2,096,000
Curtailment loss 1,218,000 0 1,650,000
Amortization of net transition obligation 0 0 0
Net periodic benefit cost, including amount capitalized 4,862,000 1,781,000 9,335,000
Less amount capitalized 1,196,000 791,000 1,127,000
Net periodic benefit cost 3,666,000 990,000 8,208,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]      
Net (gain) loss 76,310,000 20,477,000 (29,000,000)
Prior service cost (credit) 0 353,000 0
Amortization of actuarial loss (4,656,000) (2,622,000) (2,096,000)
Amortization of prior service (cost) credit (1,263,000) (152,000) (2,255,000)
Amortization of net transition obligation 0 0 0
Total recognized in accumulated other comprehensive (income) loss 70,391,000 18,056,000 (33,351,000)
Total recognized in net periodic benefit cost and accumulated other comprehensive (income) loss 74,057,000 19,046,000 (25,143,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) (7,600,000)    
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) (85,000)    
Weighted average assumptions used to determine benefit obligations [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.16% 5.26%  
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Assets 7.75% 7.75%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase   4.00%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 5.26% 5.75%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.75% 8.25%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 4.00% 4.00%  
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Minimum 60.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum 70.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities, Range Minimum 30.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities, Range Maximum 40.00%    
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 1,443,000 1,357,000 2,206,000
Interest cost 4,700,000 4,817,000 5,465,000
Expected return on assets (5,051,000) (5,512,000) (5,471,000)
Amortization of prior service cost (credit) (2,677,000) (3,303,000) (2,756,000)
Recognized net actuarial loss 753,000 845,000 970,000
Curtailment loss 0 0 0
Amortization of net transition obligation 2,125,000 2,125,000 2,125,000
Net periodic benefit cost, including amount capitalized 1,293,000 329,000 2,539,000
Less amount capitalized (50,000) (92,000) 330,000
Net periodic benefit cost 1,343,000 421,000 2,209,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]      
Net (gain) loss 23,863,000 1,462,000 (2,314,000)
Prior service cost (credit) 0 121,000 (9,321,000)
Amortization of actuarial loss (753,000) (845,000) (970,000)
Amortization of prior service (cost) credit 2,677,000 3,303,000 2,756,000
Amortization of net transition obligation (2,125,000) (2,125,000) (2,125,000)
Total recognized in accumulated other comprehensive (income) loss 23,662,000 1,916,000 (11,974,000)
Total recognized in net periodic benefit cost and accumulated other comprehensive (income) loss 25,005,000 2,337,000 (9,765,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) (1,900,000)    
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) (1,100,000)    
Defined Benefit Plan, Amortization of Net Transition Asset (Obligation) (2,100,000)    
Weighted average assumptions used to determine benefit obligations [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.13% 5.21%  
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Assets 6.75% 6.75%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 4.00% 4.00%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 5.21% 5.75%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 6.75% 7.25%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 4.00% 4.00%  
Percentage excess over the health care cost trend rate that retiree contributions will generally increase each year 6.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Minimum 65.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum 75.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities, Range Minimum 25.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities, Range Maximum 35.00%    
Health care trend rate assumed for next year (minimum) 6.00% 6.00%  
Health care trend rate assumed for next year (maximum) 8.00% 8.50%  
Health care cost trend rate - ultimate (minimum) 5.00% 5.00%  
Health care cost trend rate - ultimate (maximum) 6.00% 6.00%  
Year in which ultimate trend rate achieved (minimum) 1999 1999  
Year in which ultimate trend rate achieved (maximum) 2017 2017  
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components 171,000    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components (822,000)    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 3,175,000    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation $ (10,946,000)