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Restructuring (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]        
Non-cash restructuring, net $ 0 $ 0 $ (1,888,000) $ 661,000
Maximum [Member]
       
Restructuring Cost and Reserve [Line Items]        
Expected restructuring charges     $ 8,000,000