Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details 2)

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Benefit Plans (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
SERP & SRIP $ 1,800,000 $ 1,800,000 $ 2,900,000  
Defined Contribution Plan 15,000,000 8,800,000 3,100,000  
Amounts Recognized in Balance Sheet        
Amounts Recognized in Balance Sheet 177,092,000 156,551,000    
Amounts Recognized in Other Comprehensive Income (Loss)        
Other Comprehensive Income Loss Reclassification Pension And Other Postretirement Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax (215,628,000) (166,183,000) (151,564,000)  
Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax 30,261,000 34,688,000 39,093,000  
Other Comprehensive Income Loss Reclassification Pension And Other Postretirement Benefit Plans Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Net Of Tax 3,000 6,000 3,000  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax $ (185,364,000) $ (131,489,000) $ (112,468,000) $ (163,575,000)