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Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Foreign currency translation adjustments $ 38,660 $ 30,931
Joint venture cash flow hedges (1,336) (1,468)
Unrecognized components of employee benefit plans, net of tax (93,633) (97,821)
Total $ (56,309) $ (68,358)