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Restructuring Charges (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restructuring Charges (Textual) [Abstract]      
Restructuring charges $ 5,490,000 $ 16,396,000 $ 14,444,000
Restructuring Charges [Member]
     
Restructuring Charges (Textual) [Abstract]      
Restructuring liability   $ 100,000 $ 2,000,000