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Postretirement Benefits Other Than Pensions (Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]        
Other $ 16,000   $ 10,848  
Net periodic benefit cost   13,849 12,975 21,053
Immaterial error correction    

During the third quarter of 2011, we identified groups of employees who were eligible to receive other postretirement benefits that had historically been excluded from our benefit plan valuations, which resulted in an understatement of our benefit obligations and net periodic benefit cost. These errors relate primarily to periods prior to 2011. As the effects of the errors are not material to our Consolidated Financial Statements for the year ended December 31, 2011 and were not material to any individual period prior to 2011, we recorded a non-cash charge, and the related benefit obligation, of $16.0 million during the third quarter of 2011, of which $0.8 million relates to the year ended December 31, 2011 and $15.2 million relates to prior periods. The charge and the corresponding liability have been recorded in general and administrative expenses in our Consolidated Statements of Operations and other long term liabilities in our Consolidated Balance Sheets, respectively, for the year ended December 31, 2011.

   
Net Periodic Benefit Cost [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service and interest cost   789 991 988
Prior service cost   (66) (66) (333)
Unrecognized net loss   494 524 1,061
Effect of curtailment       (24)
Other   16,012 [1]    
Net periodic benefit cost   $ 17,229 $ 1,449 $ 1,692
[1] As described more fully in the funded status table above, this amount represents an increase in our net periodic benefit cost for the year ended December 31, 2011 as a result of identifying groups of employees who were eligible to receive other postretirement benefits that had historically been excluded from our benefit plan valuations.