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, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
SERP & SRIP $ 2,500,000 $ 1,800,000 $ 1,800,000  
Defined Contribution Plan 16,926,000 14,980,000 8,787,000  
Amounts Recognized in Balance Sheet [Abstract]        
Amounts Recognized in Balance Sheet 213,335,000 177,092,000    
Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net acturial loss (262,187,000) (215,628,000) (166,183,000)  
Prior service cost 25,788,000 30,261,000 34,688,000  
Transition liability 0 3,000 6,000  
Defined benefit pension plans $ (236,399,000) $ (185,364,000) $ (131,489,000) $ (112,468,000)