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Other Comprehensive Income (OCI) (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Accumulated Other Comprehensive Loss      
Cash flow hedges $ (33,685) $ (39,137) $ (44,187)
Pension and postretirement plans (134,044) (138,202) (143,271)
Accumulated other comprehensive loss $ (167,729) $ (177,339) $ (187,458) [1]
[1] As Restated, See Note 1