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Restructuring Plans (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended12 Months Ended
Mar. 31, 2010
Sep. 30, 2011
Dec. 31, 2010
2010 Restructuring Charges [Member]
   
Restructuring charges$ 87,108  
Restructuring charges related to acceleration of RSUs46,880  
Liability associated with restructuring plan 13,03621,381
Other than cash payments for restructuring plan 8,345 
2009 Restructuring Charges [Member]
   
Liability associated with restructuring plan 4,9015,427
Other than cash payments for restructuring plan $ 526