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Restructuring (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 0 $ 0 $ 0 $ 0
Minimum [Member]
       
Restructuring Cost and Reserve [Line Items]        
Expected restructuring charges     2,000,000  
Maximum [Member]
       
Restructuring Cost and Reserve [Line Items]        
Expected restructuring charges     $ 11,000,000