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Restructuring (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]        
Non-cash restructuring, net $ 0 $ 0 $ (1,782,000) $ 1,031,000
Maximum [Member]
       
Restructuring Cost and Reserve [Line Items]        
Expected restructuring charges     $ 8,000,000