Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details Textuals)

v2.4.0.8
Benefit Plans (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Benefit Plans (Textuals) [Abstract]      
Contribution to plan $ 75,000,000    
Employees retirement age for health care and life insurance benefits under unfunded defined benefit post-retirement plan 55    
Employees vesting service under defined benefit post-retirement plan, minimum 10 years    
Life insurance coverage, maximum 50,000    
Defined Benefit Plan, Accumulated Benefit Obligation 775,200,000 651,300,000  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Asset      
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation 150,200,000    
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation 141,600,000    
Defined Benefit Plan Expenses 1,100,000 800,000 1,000,000
Estimated Net Periodic Pension Cost In Next Fiscal Year 42,700,000    
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Pension and Other Postretirement Defined Benefit Plans, Liabilities 35,400,000 26,900,000  
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Defined Benefit Plan, Amortization of Net Transition Asset (Obligation) 0    
Defined Benefit Plan Future Amortization Of Prior Service Cost Credit 7,100,000    
Defined Benefit Plan Future Amortization Of Gain Loss 38,500,000    
Average duration of plan assets investment in bonds, years 12 years 0 months    
Defined Benefit Plans Estimated Future Employer Contributions In Next Fiscal Year 2,800,000    
Base pay contributed to the plan up to first 3% up to first 4%    
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]      
Effect of One Percentage Point Increase on Service and Interest Cost Components 10,000    
Effect of One Percentage Point Decrease on Service and Interest Cost Components 10,000    
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 10,000    
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation 20,000    
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 2028    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 4.50%    
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate These rates are assumed to decrease gradually    
Estimated Net Periodic Post Retirement Benefit Cost In Next Fiscal Year 0    
Estimated Life Of Benefit Obligations 14 years    
Fair value of plan assets, Percentage 100.00% 100.00%  
Pension Benefits [Member]
      
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]      
Curtailments (34,613,000) 0 0
Post Retirement Benefits [Member]
      
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Defined Benefit Plans Estimated Future Employer Contributions In Next Fiscal Year 3,100,000    
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]      
Curtailments $ 0 $ 0 $ 0
Post 65 [Member]
      
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 8.20%    
Equity Securities [Member]
      
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Defined Benefit Plan, Actual Plan Asset Allocations 55.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 20.00%    
Defined Benefit Plan, Target Plan Assets Allocation Range Maximum 50.00%    
Covered Bonds [Member]
      
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Defined Benefit Plan, Actual Plan Asset Allocations 44.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 50.00%    
Defined Benefit Plan, Target Plan Assets Allocation Range Maximum 80.00%    
Covered Bonds [Member] | Pre 65 [Member]
      
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 7.70%    
Cash and Cash Equivalents [Member]
      
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Defined Benefit Plan, Actual Plan Asset Allocations 1.00%